Dual-gas source gas control system with anti-gas source misconnection and control circuit thereof

ABSTRACT

A dual-gas source gas control system with anti-gas source misconnection and a control circuit thereof belonging to the gas combustion technical field are provided. The disclosure solves unreasonable design and other problems in the related art. The dual-gas source gas control system with anti-gas source misconnection and the control circuit thereof includes a power-on circuit, connected in series with an external power supply and an igniter switch to form a loop, including a self-locking switch triode connected in series with the external power supply and a self-locking amplifying triode connected to a base electrode of the self-locking switch triode; an MCU control circuit, including an MCU control chip, wherein the power-on circuit is connected to a power input pin of the MCU control chip, one pin on the MCU control chip is configured to detect whether the power-on circuit is connected.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of China application serialno. 201910175998.1, filed on Mar. 8, 2019. The entirety of theabove-mentioned patent application is hereby incorporated by referenceherein and made a part of this specification.

BACKGROUND Technical Field

The disclosure relates to a gas combustion technical field, and inparticular, relates to a dual-gas source gas control system withanti-gas source misconnection and a control circuit thereof.

Description of Related Art

With the diversification of energy in the global market, many countriesare using both natural gas and liquefied petroleum gas. According to thedifference between the calorific values and the pressure during use ofthese two types of gas: liquefied petroleum gas is a high calorificvalue gas, and the pressure during use is high, and natural gas is a lowcalorific value gas, and the pressure is low during use. Gas appliancesthat match two different energy sources are thus provided. In order tointegrate resources and meet market demand, gas appliances are designedas dual gas control systems that can use natural gas as well asliquefied petroleum gas.

The operating principle of the existing dual gas source gas controlsystem is provided as follows. After high calorific value gas isintroduced into a high calorific value gas voltage regulator valve, thegas passes through a high calorific value gas voltage regulator valvefor voltage stabilizing and enters a switch control valve. A knob of aswitch control valve is pressed, so that the gas is inputted into a gaspath conversion device from the switch control valve. At this moment,the gas path in the gas path conversion device is manually set as a highcalorific value gas path. After passing through the high calorific valuegas path inside the gas path conversion device, the gas is inputted to ahigh calorific value gas lighter first. The igniter is pressed, the highcalorific value gas in the high calorific value gas lighter is ignitedby an igniter needle, and the high calorific value gas burns a nearbythermocouple after being burned. The thermocouple continues to supplypower to a solenoid valve in the switch control valve. After thesolenoid valve in the switch control valve begins to function, the gaspath leading to a high calorific value gas nozzle mouth in the switchcontrol valve is opened. The knob of the switch control valve isrotated, and the gas is inputted into the high calorific value gasnozzle mouth in the gas path conversion device and is directly inputtedinto the main burner after passing though the high calorific value gasnozzle mouth. The high calorific value gas outputted from the burner ofthe main burner is ignited by pilot flame on the high calorific valuegas lighter. The gas appliance begins to work normally at this moment.After low calorific value gas is introduced into a low calorific valuegas voltage regulator valve, the gas passes through a low calorificvalue gas voltage regulator valve for voltage stabilizing and enters aswitch control valve. A knob of a switch control valve is pressed, sothat the gas is inputted into a gas path conversion device from theswitch control valve. At this moment, the gas path in the gas pathconversion device is manually set as a low calorific value gas path.After passing through the low calorific value gas path in the gas pathconversion device, the gas is inputted to a low calorific value gaslighter first. The igniter is pressed, the low calorific value gas inthe low calorific value gas lighter is ignited by an igniter needle, andthe low calorific value gas burns a nearby thermocouple after beingburned. The thermocouple continues to supply power to a solenoid valvein the switch control valve. After the solenoid valve in the switchcontrol valve begins to function, the gas path leading to a lowcalorific value gas nozzle mouth in the switch control valve is opened.The knob of the switch control valve is rotated, and the gas is inputtedinto the low calorific value gas nozzle mouth in the gas path conversiondevice and is directly inputted into the main burner after passingthough the low calorific value nozzle mouth. The low calorific value gasoutputted from the burner of the main burner is ignited by pilot flameon the low calorific value gas lighter, and the gas appliance begins towork normally at this moment.

Since manual operation is required by gas connection and gas pathconfiguration of a gas path conversion device, misconnection may happen.Since the calorific values and pressures of the two types of gas aredifferent during use, when high calorific value gas enters the wrong gasoperating channel, the risk of presence of a high flame appears, andsafety and property of a user may thereby be threatened.

SUMMARY

A purpose of the disclosure is to provide a reasonably-designed controlcircuit for solving the problems of which high calorific value gas ismisconnected to a low calorific value voltage regulator valve and entersa low calorific value gas lighter, and a solenoid valve in a switchcontrol valve cannot be automatically closed instantly when the highcalorific value gas simultaneously enters a first main gas nozzle mouthand a second main gas nozzle mouth in terms of the foregoing problems.

Another purpose of the disclosure is to provide a reasonably-designeddual-gas source gas control system with anti-gas source misconnectionoffering high degree of safety and security in terms of the foregoingproblems.

Still another purpose of the disclosure is to provide anotherreasonably-designed dual-gas source gas control system with anti-gassource misconnection offering safety and security in terms of theforegoing problems.

To accomplish the foregoing purposes, the following technical solutionsare adopted by the disclosure. A control circuit provided by thedisclosure includes a power-on circuit, connected in series with anexternal power supply and an igniter switch to form a loop, including aself-locking switch triode connected in series with the external powersupply and a self-locking amplifying triode connected to a baseelectrode of the self-locking switch triode; an MCU control circuit,including an MCU control chip, wherein the power-on circuit is connectedto a power input pin of the MCU control chip, one pin on the MCU controlchip is configured to detect whether the power-on circuit is connected,another pin on the MCU control chip is connected to a base electrode ofthe self-locking amplifying triode in the power-on circuit to beconfigured to send a driving signal to drive the self-lockingamplification triode in the power-on circuit to be turned on when thepower-on circuit is detected to be connected, so that the self-lockingswitch triode and the self-locking amplifying triode are turned on toform self-locking and maintain a power-on state; a pulse ignitioncircuit, including an oscillating loop powered by the power-on circuit,wherein the oscillating loop generates an inducted ignition high voltageand discharges to an outside through an external low calorific value gasignition needle and a high calorific value gas ignition needle connectedthereto, and one pin on the MCU control chip sends a control signal tocontrol magnitude of an oscillating voltage of the oscillating loop; agas misconnection flame detection circuit, including a comparatorpowered by the power-on circuit and configured for receiving a flamesignal sent from an external flame sensor, wherein a voltage signalgenerated by the flame sensor is transmitted to one input pin of thecomparator, the flame signal is outputted from an output pin of thecomparator to a base electrode of a detection amplifying triodeconnected to the comparator, the flame signal passing through thedetection amplifying triode is transmitted onto the MCU control chipthrough an input pin on the MCU control chip that is connected to thedetection amplification triode and that is configured for receiving theflame signal, the flame sensor generates a negative voltage signal tothe input pin configured for receiving the flame signal on thecomparator when a high calorific value gas is misconnected to a lowcalorific value gas lighter, the output pin configured for outputtingthe flame signal on the comparator outputs a high electrical level tothe base electrode of the detection amplifying triode, the detectionamplifying triode transmits the amplified flame signal to the input pinconfigured for receiving the flame signal on the MCU control chip, afteran output pin on the MCU control chip that is configured for sending adriving signal for driving a gas path to be cut off receives the flamesignal indicating misconnection, the output pin sends the driving signalconfigured for driving the gas path to be cut off to an externalcorresponding gas path on/off control device, and a cutting offoperation of a first solenoid valve in a switch control valve iscontrolled by the gas path on/off control device. The flame signaltransmitted by the external flame sensor connected thereto is detectedthrough the gas misconnection flame detection circuit and the signal issent to the MCU control circuit. A driving signal configured for drivingthe gas path to be cut off to an external corresponding gas path on/offcontrol device is sent from the MCU control circuit. In this way, whenthe high calorific value gas is misconnected to the low calorific valuevoltage regulator valve, enters the low calorific value gas lighter, andsimultaneously enters the first main gas nozzle mouth and the secondmain gas nozzle mouth, safety and security are provided.

In the control circuit, the output pin on the MCU control chipconfigured for transmitting the driving signal for driving the gas pathto be cut off is disposed on a wire of opposite polarity to the outputpin in two wires connected an external thermocouple parallel circuit andthe external first solenoid valve. The thermocouple parallel circuit isformed by a connection between an anode of a low calorific value gasthermocouple and an anode of a high calorific value gas thermocouple anda connection between a cathode of the low calorific value gasthermocouple and a cathode of the high calorific value gas thermocouple.When the input pin of the MCU control chip connected to the gasmisconnection flame detection circuit detects that the high calorificvalue gas is misconnected to the low calorific value gas lighter, theoutput pin on the MCU control chip outputs a voltage of polarityopposite to an output voltage of the thermocouple parallel circuit, sothat current balancing is instantly and forcibly performed to athermoelectric potential generated by the fired low calorific value gasthermocouple or the voltage is set to zero. The thermoelectric potentialwhich keeps the first solenoid valve on the switch control valve to beclosed is lost, and the first solenoid valve is not closed to preventexternal gas from entering the gas path of the system through the switchcontrol valve. When the high calorific value gas is misconnected to thelow calorific value voltage regulator valve, the first solenoid valve onthe switch control valve may be set not to be closed to prevent externalgas from entering, so that the purpose of safety, prevention, andcontrol is achieved.

In the control circuit, a pair of anode and cathode power output pinsconfigured for transmitting the driving signal for driving the gas pathto be cut off on the MCU control chip is electrically connected to theexternal low calorific value gas lighter and a second solenoid valve inan on/off valve on a low calorific value ignition gas path betweenoutput ends corresponding to the low calorific value gas lighter on agas path conversion valve through a motor control driver chip. When theinput pin connected to the gas misconnection flame detection circuit onthe MCU control chip detects that the high calorific value gas ismisconnected to the low calorific value gas lighter, the pair of anodeand cathode power output pins transmits the driving signal for drivingthe gas path to be cut off, so that the second solenoid valve which isbeing closed on the on/off valve is detached instantly to close the lowcalorific value ignition gas path.

A gas flame is reduced until being put out without burning the lowcalorific value gas thermocouple, such that the low calorific value gasthermocouple cannot continuously supply power to the first solenoidvalve in the switch control valve. The first solenoid valve in theswitch control valve which does not receive power supply is not closedto prevent external gas from entering the gas path in the system throughthe switch control valve. When the high calorific value gas ismisconnected to the low calorific value voltage regulator valve, aswitching off signal is outputted to the second solenoid valve on theon/off valve connected to the MCU control circuit through the MCUcontrol circuit, so that the second solenoid valve in a closed state isinstantly opened. The flame of the low calorific value gas lighter maythus be extinguished since no low calorific value gas is continuouslysupplied. The thermocouple no longer generates a thermoelectricpotential since no flame is sensed and thus may not provide electricityenergy to the first solenoid valve connected thereto on the switchcontrol valve. In this way, the first solenoid valve is not closed toprevent external gas from entering the gas path.

The control circuit further includes a boost circuit connected to thepower-on circuit and including a boost chip and an inductor. A poweroutput pin of the boost chip transmits a boosted voltage to any one or aplurality of the MCU control circuit, the pulse ignition circuit and thegas misconnection flame detection circuit. Arrangement of the boostercircuit improves the voltage supply capability to other circuits in thecontrol circuit.

In the control circuit, an alarm circuit including a buzzer and an alarmamplifying triode is also included, and a base electrode of the alarmamplifying triode receives an alarm signal sent from an output pin onthe MCU control chip. Arrangement of the alarm circuit enables a user toobtain alarm information immediately, and total gas paths may be closedthrough a knob on the switch control valve through manual operation.

In the control circuit, an electronically controlled conversion valvecontrol circuit is also provided and includes a first valve driving chipconfigured for driving a main gas channel switching solenoid valve in anexternal electronically controlled gas path conversion valve, and asecond valve driving chip configured for controlling and driving anignition gas channel switching solenoid valve in the externalelectronically controlled gas path conversion valve. The first valvedriving chip and the second valve driving chip respectively receivevalve control information sent from the MCU control chip. Two pins inthe MCU control chip are respectively connected in series with a lowcalorific value voltage regulator switching switch in an external lowcalorific value voltage regulator valve and a high calorific valuevoltage regulator switching switch in a high calorific value voltageregulator valve. When receiving information on the low calorific valuevoltage regulator switching switch or the high calorific value voltageregulator switching switch being in a closed state, the MCU control chipsends the corresponding valve control information to the first valvedriving chip and the second valve driving chip.

A dual-gas source gas control system with anti-gas source misconnectionincludes a low calorific value voltage regulator valve and a highcalorific value voltage regulator valve. An input end and an output endof the low calorific value voltage regulator valve are respectivelyconnected to a low calorific value gas path configured for transmittinga low calorific gas source, and an input end and an output end of thehigh calorific value voltage regulator valve are respectively connectedto a high calorific value gas path configured for transmitting a highcalorific gas source. A switch control valve acts as a master switchconfigured for controlling a gas path to be cut off, is provided with afirst solenoid valve configured for controlling the switch control valveto be turned on or turned off, and includes two input ends, wherein oneof the input ends is connected to the low calorific value voltageregulator valve through the low calorific value gas path, and the otherone of the input ends is connected the high calorific value voltageregulator valve through the high calorific value gas path, and furtherincludes two output ends respectively connected to a main gas path andan ignition gas path one by one. A gas path conversion valve includestwo input ends, wherein one of the input ends is connected to the outputend of the switch control valve communicating with the main gas path,and the other one of the input ends is connected to the output end ofthe switch control valve communicating with the ignition gas path, andfurther includes four output ends, wherein the four output ends arerespectively communicated with a low calorific value ignition gas pathleading to a low calorific value gas ignition device, a high calorificvalue ignition gas path leading to a high calorific value gas ignitiondevice, and a first main gas nozzle mouth and a second main gas nozzlemouth leading to a main burner one by one, further including a highcalorific value gas internal path, a low calorific value gas internalpath, and a knob or a switch configured for switching between the highcalorific value gas internal path and the low calorific value gasinternal path, wherein the low calorific value gas internal path isrespectively communicated with low calorific value ignition gas path,the first main gas nozzle mouth, and a second main gas nozzle mouth, andthe high calorific value gas internal path is respectively communicatedwith the high calorific value ignition gas path and the first main gasnozzle mouth. The main burner, wherein an input end thereof are disposedcorresponding to the first main gas nozzle mouth and the second main gasnozzle mouth on the gas path conversion valve, so that gas emitted fromthe first main gas nozzle mouth and the second main gas nozzle mouthdirectly enters the input end of the main burner, and a burner openingrequired by high calorific value gas and low calorific value gas to burnnormally is disposed at an outer side of the main burner. The lowcalorific value gas ignition device includes a low calorific value gaslighter near the burner opening required for burning of the lowcalorific value gas on the main burner and a low calorific value gasignition needle and a low calorific value gas thermocouple disposedadjacent to the low calorific value gas lighter, wherein the lowcalorific value gas lighter is connected to a corresponding output endon the gas path conversion valve through the low calorific valueignition gas path. The high calorific value gas ignition device includesa high calorific value gas lighter near the burner opening required forburning of the high calorific value gas on the main burner and a highcalorific value gas ignition needle and a high calorific value gasthermocouple disposed adjacent to the high calorific value gas lighter,wherein the high calorific value gas lighter is connected to acorresponding output end on the gas path conversion valve through thehigh calorific value ignition gas path; an igniter, electricallyconnected to the low calorific value gas ignition needle and the highcalorific value gas ignition needle respectively. The system furtherincludes a flame sensor disposed at one side near the low calorificvalue gas thermocouple and away from the low calorific value gaslighter, and configured for detecting a flame signal. The igniter isprovided with a power supply and an error-proof control circuitelectrically connected thereto, the error-proof control circuit is thecontrol circuit electrically connected to the flame sensor, after anigniter switch on the igniter is pressed, electricity is transmitted tothe connected control circuit, and the control circuit begins tofunction and receive the flame signal sent from the flame sensor;wherein an anode of the low calorific value gas thermocouple isconnected to an anode of the high calorific value gas thermocouple, acathode of the low calorific value gas thermocouple and a cathode of thehigh calorific value gas thermocouple are connected to form athermocouple parallel circuit, an anode and a cathode of thethermocouple parallel circuit are electrically connected to an anode anda cathode of the first solenoid valve respectively one by one, oneoutput end of the control circuit is disposed on one wire of oppositepolarity to the output end in two wires connecting the thermocoupleparallel circuit and the first solenoid valve, when the control circuitdetects the flame signal from the flame sensor indicating that the highcalorific value gas is misconnected to the low calorific value gaslighter, the output end outputs a voltage of opposite polarity to anoutput voltage outputted by the thermocouple parallel circuit, so thatcurrent balancing is instantly and forcibly performed to athermoelectric potential generated by the fired low calorific value gasthermocouple or the voltage is set to zero, the first solenoid valve inthe switch control valve without receiving power supply is not closed toprevent external gas from entering the gas path in the system throughthe switch control valve. When the high calorific value gas ismisconnected to the low calorific value voltage regulator valve, avoltage of opposite polarity to an output voltage of the thermocoupleparallel circuit is outputted through the control circuit, so thatcurrent balancing is instantly and forcibly performed to athermoelectric potential generated by the fired low calorific value gasthermocouple or the voltage is set to zero to prevent external gas fromentering.

In the dual-gas source gas control system with anti-gas sourcemisconnection, an over voltage protection device is disposed on the lowcalorific value ignition gas path between the output ends correspondingto the low calorific value gas lighter on the low calorific value gaslighter and the gas path conversion valve. When the high calorific valuegas is mistakenly introduced to the low calorific value gas lighterafter passing through the high calorific value voltage regulator valve,or when the low calorific value gas is mistakenly passes through thehigh calorific value gas voltage regulator valve and is introduced tothe low calorific value gas lighter, since the pressure of the gas inthe low calorific value ignition gas path exceeds a pressure preset bythe over voltage protection device, the over voltage protection deviceautomatically closes the gas path at this moment.

In the dual-gas source gas control system with anti-gas sourcemisconnection, the gas path conversion valve is a manual gas pathconversion valve and includes a valve body, wherein an outer peripheryof the valve body is provided with an internally-communicated lowcalorific value gas lighter outlet, a high calorific value gas lighteroutlet, a gas lighter gas path inlet, and a main inlet; a spool isprovided and is disposed in the valve body, a connection groove isdisposed on an outer periphery of the spool, the spool rotates so thatthe connection groove is communicated with the low calorific value gaslighter outlet and the gas lighter gas path inlet or is communicatedwith the high calorific value gas lighter outlet and the gas lighter gaspath inlet; a valve seat is provided and is disposed on an upper end ofthe valve body, a valve rod is slidably inserted into the valve seat, anupper end of the valve rod exposes out of the valve seat, a lower end ofthe valve rod is loosely connected to the other end of a connectionrotation shaft with one end disposed on the spool, the connectionrotation shaft is sleeved with a reset spring for resetting the valverod after operation. The gas path conversion valve further includes adouble gas nozzle communicated with the main inlet and disposed at anlower end of the valve body, a circle-shaped barrier is protruded at aninner side of the double gas nozzle, at least one in-circle nozzle mouthmerely for the low calorific value gas to be emitted is provided in thecircle-shaped barrier on the double gas nozzle, at least one outernozzle mouth for the low calorific value gas or the high calorific valuegas to be emitted is disposed between an outer periphery of the doublegas nozzle and the circle-shaped barrier, the first main gas nozzlemouth is the outer nozzle mouth, and the second main gas nozzle mouth isthe in-circle nozzle mouth, an inner gas transfer chamber for merely thelow calorific value gas to enter and an outer gas transfer chambersurrounding an outer periphery of the inner gas transfer chamber for thelow calorific value gas or the high calorific value gas to enter arerespectively formed when the double gas nozzle and the valve body areconnected, the inner gas transfer chamber is communicated with thein-circle nozzle mouth, and the outer gas transfer chamber iscommunicated with the outer nozzle mouth; a spool through hole assemblyis disposed on the spool, two ends of the spool through hole assemblyare respectively communicated with the inner gas transfer chamber and alow gas transfer channel communicated with the main inlet and disposedon the valve body in a sealed manner, and the low calorific value gas isintroduced in or the high calorific value gas is prevented from enteringthe inner gas transfer chamber through rotation of the spool, so that aneffective gas-intake cross-sectional area corresponding to requirementfrom the high and low calorific value gas on the double gas nozzle isadjusted.

In the dual-gas source gas control system with anti-gas sourcemisconnection, wherein the spool through hole assembly includes a firstspool hole axially disposed near an end of the double gas nozzle on thespool, the first spool hole is communicated with the inner gas transferchamber in a sealed manner, a second spool hole communicating with thefirst spool hole is disposed at an outer side of the spool, the secondspool hole is communicated with the low gas transfer channel in a sealedmanner; the spool is tapered, the spool matches a size and a shape of aspace in the valve body accommodating the spool, a low calorific valuegas limitation groove and a high calorific value gas limitation grooveare disposed in the valve seat in a high and low manner and in amisaligned arrangement, a boss is disposed on the valve rod, the valverod downwardly moves so that the valve rod passes the connectionrotation shaft to drive the spool to rotate to switch the ignitiondevice gas paths between the high and low calorific value gas, the bossis engaged in a corresponding limitation groove so that the valve rod ispositioned; the connection groove has a sector structure with an angleof 180 degrees, the low calorific value gas lighter outlet and the gaslighter gas path inlet are located on a same center line, a center lineof the high calorific value gas lighter outlet and a center line of thelow calorific value gas lighter outlet are in a same plane; a damperregulation structure for regulating gas intake in a gas main tube isdisposed between an outer end of the double gas nozzle and the gas maintube connected to an outer portion of the main burner, and one end ofthe damper regulation structure is connected to an outer end of thevalve rod.

In the dual-gas source gas control system with anti-gas sourcemisconnection, wherein a first connection short tube is disposed betweenthe circle-shaped barrier and the valve body in a sealed manner fortransferring the low calorific value gas; the double gas nozzle and thecircle-shaped barrier are integrally connected in one piece; the damperregulation structure includes a second connection short tube disposedbetween the main burner and the external gas main tube in a sealedmanner, a first damper for air to enter is disposed at one side of thesecond connection short tube, a rotation barrel having a size and ashape matched with that of the second connection short tube is disposedat an outer periphery of the second connection short tube, a seconddamper corresponding to the first damper is disposed on the rotationbarrel, a damper linking rod capable of driving the rotation barrel andthe valve rod to simultaneously rotate is disposed between the rotationbarrel and the valve rod; at least a pair of axial limitation ribs forlimiting the rotation barrel to move in an axial direction of the secondconnection short tube protrudes from an outer side of the secondconnection short tube; connection between the damper linking rod and therotation barrel and connection between the damper linking rod and thevalve rod are detachable; a knob is disposed at an outer end of thevalve rod, and the knob is connected to the damper linking rod.

In the dual-gas source gas control system with anti-gas sourcemisconnection, wherein the gas path conversion valve is anelectronically controlled gas path conversion valve and includes a maingas channel switching solenoid valve respectively communicated with oneinput end communicating with the main gas path, one output endcommunicating with the first main gas nozzle mouth, and one output endcommunicating with the second main gas nozzle mouth, whether gasintroduced from the input end is simultaneously introduced to the twooutput ends or is only introduced to one output end communicating withthe first main gas nozzle mouth is determined according to a gascalorific value, an ignition gas channel switching solenoid valve isfurther provided and is communicated with one input end communicatingwith the ignition gas path, one output end communicating with the lowcalorific value ignition gas path, and one output end communicating withthe high calorific value ignition gas path, whether gas introduced fromthe input end is introduced to one output end communicating with the lowcalorific value ignition gas path or is introduced to one output endcommunicating with the high calorific value ignition gas path isdetermined according to a gas calorific value; each of the low calorificvalue voltage regulator valve and the high calorific value voltageregulator valve is a switch voltage regulator valve for switching, thelow calorific value voltage regulator valve includes a low calorificvalue voltage regulator switching switch, and the high calorific valuevoltage regulator valve includes a high calorific value voltageregulator switching switch.

Another dual-gas source gas control system with anti-gas sourcemisconnection includes a low calorific value voltage regulator valve anda high calorific value voltage regulator valve. An input end and anoutput end of the low calorific value voltage regulator valve arerespectively connected to a low calorific value gas path configured fortransmitting a low calorific gas source, and an input end and an outputend of the high calorific value voltage regulator valve are respectivelyconnected to a high calorific value gas path configured for transmittinga high calorific gas source; a switch control valve, acting as a masterswitch configured for controlling a gas path to be cut off, providedwith a first solenoid valve configured for controlling the switchcontrol valve to be turned on or turned off, including two input ends,wherein one of the input ends is connected to the low calorific valuevoltage regulator valve through the low calorific value gas path, andthe other one of the input ends is connected the high calorific valuevoltage regulator valve through the high calorific value gas path, andfurther includes two output ends, respectively connected to a main gaspath and an ignition gas path one by one. A gas path conversion valveincludes two input ends, wherein one of the input ends is connected tothe output end of the switch control valve communicating with the maingas path, and the other one of the input ends is connected to the outputend of the switch control valve communicating with the ignition gaspath, and further includes four output ends, wherein the four outputends are respectively communicated with a low calorific value ignitiongas path leading to a low calorific value gas ignition device, a highcalorific value ignition gas path leading to a high calorific value gasignition device, and a first main gas nozzle mouth and a second main gasnozzle mouth leading to a main burner one by one, and further includes ahigh calorific value gas internal path, a low calorific value gasinternal path and a knob or a switch configured for switching betweenthe high calorific value gas internal path and the low calorific valuegas internal path, wherein the low calorific value gas internal path isrespectively communicated with low calorific value ignition gas path,the first main gas nozzle mouth, and a second main gas nozzle mouth, andthe high calorific value gas internal path is respectively communicatedwith the high calorific value ignition gas path and the first main gasnozzle mouth. The main burner, wherein an input end thereof are disposedcorresponding to the first main gas nozzle mouth and the second main gasnozzle mouth on the gas path conversion valve, so that gas emitted fromthe first main gas nozzle mouth and the second main gas nozzle mouthdirectly enters the input end of the main burner, and a burner openingrequired by high calorific value gas and low calorific value gas to burnnormally is disposed at an outer side of the main burner. The lowcalorific value gas ignition device, including a low calorific value gaslighter near the burner opening required for burning of the lowcalorific value gas on the main burner, a low calorific value gasignition needle and a low calorific value gas thermocouple disposedadjacent to the low calorific value gas lighter, wherein the lowcalorific value gas lighter is connected to a corresponding output endon the gas path conversion valve through the low calorific valueignition gas path; the high calorific value gas ignition device includesa high calorific value gas lighter near the burner opening required forburning of the high calorific value gas on the main burner and a highcalorific value gas ignition needle and a high calorific value gasthermocouple disposed adjacent to the high calorific value gas lighter,wherein the high calorific value gas lighter is connected to acorresponding output end on the gas path conversion valve through thehigh calorific value ignition gas path. An igniter is electricallyconnected to the low calorific value gas ignition needle and the highcalorific value gas ignition needle respectively. The system furtherincludes a flame sensor disposed at one side near the low calorificvalue gas thermocouple and away from the low calorific value gaslighter, and configured for detecting a flame signal; wherein theigniter further includes a power supply and an error-proof controlcircuit electrically connected thereto, the error-proof control circuitis the control circuit electrically connected to the flame sensor, afteran igniter switch on the igniter is pressed, electricity provided by thepower supply is transmitted to the connected control circuit, and thecontrol circuit begins to function and receive the flame signal sentfrom the flame sensor; wherein an anode of the low calorific value gasthermocouple is connected to an anode of the high calorific value gasthermocouple, a cathode of the low calorific value gas thermocouple anda cathode of the high calorific value gas thermocouple are connected toform a thermocouple parallel circuit, an anode and a cathode of thethermocouple parallel circuit are electrically connected to an anode anda cathode of the first solenoid valve respectively one by one, the lowcalorific value gas thermocouple generates an electric potential afterbeing burned by ignited gas, so as to continuously supply power to thefirst solenoid valve in the switch control valve, so that the firstsolenoid valve stays in a closed state and the gas path is in a turnedon state; an on/off valve disposed on the low calorific value ignitiongas path between output ends corresponding to the low calorific valuegas lighter on the low calorific value gas lighter and the gas pathconversion valve, including a second solenoid valve configured forcontrolling connection and cutting off of the low calorific valueignition gas path, wherein an anode and a cathode of the second solenoidvalve are electrically connected to an anode output level and a cathodeoutput level on the control circuit one by one, when the control circuitdetects the flame signal from the flame sensor indicating that the highcalorific value gas is misconnected to the low calorific value gaslighter, electrical levels outputted from the anode output level and thecathode output level are both zero, the second solenoid valve on theon/off valve is not closed to prevent gas in the low calorific valueignition gas path from entering the low calorific value gas lighter, agas flame is reduced until being put out without burning the lowcalorific value gas thermocouple, such that the low calorific value gasthermocouple cannot continuously supply power to the first solenoidvalve in the switch control valve, and the first solenoid valve in theswitch control valve without receiving power supply on the switchcontrol valve is not closed to prevent external gas from entering thegas path in the system through the switch control valve.

In the another dual-gas source gas control system with anti-gas sourcemisconnection, wherein an over voltage protection device is disposed onthe low calorific value ignition gas path between the output endscorresponding to the low calorific value gas lighter on the lowcalorific value gas lighter and the gas path conversion valve. When thehigh calorific value gas is mistakenly introduced to the low calorificvalue gas lighter after passing through the high calorific value voltageregulator valve, or when the low calorific value gas is mistakenlypasses through the high calorific value gas voltage regulator valve andis introduced to the low calorific value gas lighter, since the pressureof the gas in the low calorific value ignition gas path exceeds apressure preset by the over voltage protection device, the over voltageprotection device automatically closes the gas path at this moment.

In the another dual-gas source gas control system with anti-gas sourcemisconnection, wherein the gas path conversion valve is a manual gaspath conversion valve and includes a valve body, an outer periphery ofthe valve body is provided with an internally-communicated low calorificvalue gas lighter outlet, a high calorific value gas lighter outlet, agas lighter gas path inlet, and a main inlet; a spool is provided and isdisposed in the valve body, a connection groove is disposed on an outerperiphery thereof, the spool rotates so that the connection groove iscommunicated with the low calorific value gas lighter outlet and the gaslighter gas path inlet or is communicated with the high calorific valuegas lighter outlet and the gas lighter gas path inlet; a valve seat isprovided and is disposed on an upper end of the valve body, a valve rodis slidably inserted into the valve seat, an upper end of the valve rodexposes out of the valve seat, a lower end of the valve rod is looselyconnected to the other end of a connection rotation shaft with one enddisposed on the spool, the connection rotation shaft is sleeved with areset spring for resetting the valve rod after operation. The gas pathconversion valve further includes a double gas nozzle communicated withthe main inlet and disposed at an lower end of the valve body, acircle-shaped barrier is protruded at an inner side of the double gasnozzle, at least one in-circle nozzle mouth for the low calorific valuegas to be emitted is provided in the circle-shaped barrier on the doublegas nozzle, at least one outer nozzle mouth for the low calorific valuegas or the high calorific value gas to be emitted is disposed between anouter periphery of the double gas nozzle and the circle-shaped barrier,the first main gas nozzle mouth is the outer nozzle mouth), and thesecond main gas nozzle mouth is the in-circle nozzle mouth, an inner gastransfer chamber for merely the low calorific value gas to enter and anouter gas transfer chamber surrounding an outer periphery of the innergas transfer chamber for the low calorific value gas or the highcalorific value gas to enter are respectively formed when the double gasnozzle and the valve body are connected, the inner gas transfer chamberis communicated with the in-circle nozzle mouth, and the outer gastransfer chamber is communicated with the outer nozzle mouth; a spoolthrough hole assembly is disposed on the spool, two ends of the spoolthrough hole assembly are respectively communicated with the inner gastransfer chamber and a low gas transfer channel connected to the maininlet and disposed on the valve body in a sealed manner, and the lowcalorific value gas is introduced in or the high calorific value gas isprevented from entering the inner gas transfer chamber through rotationof the spool, so that an effective gas-intake cross-sectional areacorresponding to requirement from the high and low calorific value gason the double gas nozzle is adjusted.

In the another dual-gas source gas control system with anti-gas sourcemisconnection, wherein the spool through hole assembly includes a firstspool hole axially disposed near an end of the double gas nozzle on thespool, the first spool hole is communicated with the inner gas transferchamber in a sealed manner, a second spool hole communicated with thefirst spool hole is disposed at an outer side of the spool, the secondspool hole is communicated with the low gas transfer channel in a sealedmanner; the spool is tapered, the spool matches a size and a shape of aspace in the valve body accommodating the spool, a low calorific valuegas limitation groove and a high calorific value gas limitation grooveare disposed in the valve seat in a high and low manner and in amisaligned arrangement, a boss is disposed on the valve rod, the valverod downwardly moves so that the valve rod passes the connectionrotation shaft to drive the spool to rotate to switch the ignitiondevice gas paths between the high and low calorific value gas, the bossis engaged in a corresponding limitation groove so that the valve rod ispositioned; the connection groove has a sector structure with an angleof 180 degrees, the low calorific value gas lighter outlet and the gaslighter gas path inlet are located on a same center line, a center lineof the high calorific value gas lighter outlet and a center line of thelow calorific value gas lighter outlet are in a same plane; a damperregulation structure is disposed between an outer end of the double gasnozzle and a gas main tube connected to an outer portion of the mainburner for regulating gas intake in the gas main tube, and one end ofthe damper regulation structure is connected to an outer end of thevalve rod.

In the another dual-gas source gas control system with anti-gas sourcemisconnection, wherein a first connection short tube is disposed betweenthe circle-shaped barrier and the valve body in a sealed manner fortransferring the low calorific value gas; the double gas nozzle and thecircle-shaped barrier are integrally connected in one piece; the damperregulation structure includes a second connection short tube disposedbetween the main burner and the external gas main tube in a sealedmanner, a first damper for air to enter is disposed at one side of thesecond connection short tube, a rotation barrel having a size and ashape matched with that of the second connection short tube is disposedat an outer periphery of the second connection short tube, a seconddamper corresponding to the first damper is disposed on the rotationbarrel, a damper linking rod capable of driving the rotation barrel andthe valve rod to simultaneously rotate is disposed between the rotationbarrel and the valve rod; at least a pair of axial limitation ribs forlimiting the rotation barrel to move in an axial direction of the secondconnection short tube protrudes from an outer side of the secondconnection short tube; connection between the damper linking rod and therotation barrel and connection between the damper linking rod and thevalve rod are detachable; a knob is disposed at an outer end of thevalve rod, and the knob is connected to the damper linking rods.

In the another dual-gas source gas control system with anti-gas sourcemisconnection, wherein the gas path conversion valve is anelectronically controlled gas path conversion valve and includes a maingas channel switching solenoid valve respectively communicated with oneinput end communicating with the main gas path, one output endcommunicating with the first main gas nozzle mouth, and one output endcommunicating with the second main gas nozzle mouth, whether gasintroduced from the input end is simultaneously introduced to the twooutput ends or is only introduced to one output end communicating withthe first main gas nozzle mouth is determined according to a gascalorific value, an ignition gas channel switching solenoid valve isfurther provided and is communicated with one input end communicatingwith the ignition gas path, one output end communicating with the lowcalorific value ignition gas path, and one output end communicating withthe high calorific value ignition gas path, whether gas introduced fromthe input end is introduced to one output end communicating with the lowcalorific value ignition gas path or is introduced to one output endcommunicating with the high calorific value ignition gas path isdetermined according to a gas calorific value; each of the low calorificvalue voltage regulator valve and the high calorific value voltageregulator valve is a switch voltage regulator valve for switching, thelow calorific value voltage regulator valve includes a low calorificvalue voltage regulator switching switch, and the high calorific valuevoltage regulator valve includes a high calorific value voltageregulator switching switch.

Compared to the related art, advantages of the dual-gas source gascontrol system with anti-gas source misconnection and the controlcircuit thereof lie in that: when the high calorific value gas ismisconnected to the low calorific value voltage regulator valve, avoltage of opposite polarity to an output voltage of the thermocoupleparallel circuit is outputted through the control circuit, so thatcurrent balancing is instantly and forcibly performed to athermoelectric potential generated by the fired low calorific value gasthermocouple or the voltage is set to zero, alternatively, the secondsolenoid valve which is being closed on the on/off valve is controlledto be detached through the control circuit, so that the total gas pathsare closed. An over voltage protection device is provided, so when thehigh calorific value gas is mistakenly introduced to the low calorificvalue gas lighter after passing through the high calorific value voltageregulator valve, or when the low calorific value gas is mistakenlypasses through the high calorific value gas voltage regulator valve andis introduced to the low calorific value gas lighter, since the pressureof the gas in the low calorific value ignition gas path exceeds apressure preset by the over voltage protection device, the over voltageprotection device automatically closes the gas path at this moment, andsafety, protection, and control are achieved.

BRIEF DESCRIPTION OF THE DRAWINGS

To make the technical solutions provided in the embodiments of thedisclosure or in the related art more clearly illustrated, severalaccompanying drawings required by the embodiments or the related art fordescription are briefly introduced as follows. Obviously, the drawingsin the following description are only some embodiments of thedisclosure. For a person of ordinary skill in the art, other drawingscan be obtained according to these drawings without paying any creativelabor.

FIG. 1 provides a schematic diagram of a structure and connection in agas control system when a gas path conversion valve is manually operatedaccording to an embodiment of the disclosure.

FIG. 2 provides a diagram of an operating principle of low calorificvalue gas in the gas control system when the gas path conversion valveis manually operated according to an embodiment of the disclosure.

FIG. 3 provides a diagram of an operating principle of high calorificvalue gas in the gas control system when the gas path conversion valveis manually operated according to an embodiment of the disclosure.

FIG. 4 provides a diagram of an operating principle of a firstmisconnection type in the gas control system when the gas pathconversion valve is manually operated according to an embodiment of thedisclosure.

FIG. 5 provides a diagram of an operating principle of a second and athird misconnection types in the gas control system when the gas pathconversion valve is manually operated according to an embodiment of thedisclosure.

FIG. 6 provides a schematic diagram of a structure and connection inanother gas control system when a gas path conversion valve is manuallyoperated according to an embodiment of the disclosure.

FIG. 7 provides a diagram of an operating principle of low calorificvalue gas in the another gas control system when the gas path conversionvalve is manually operated according to an embodiment of the disclosure.

FIG. 8 provides a diagram of an operating principle of high calorificvalue gas in the another gas control system when the gas path conversionvalve is manually operated according to an embodiment of the disclosure.

FIG. 9 provides a diagram of an operating principle of a firstmisconnection type in the another gas control system when the gas pathconversion valve is manually operated according to an embodiment of thedisclosure.

FIG. 10 provides a diagram of an operating principle of a second and athird misconnection types in the another gas control system when the gaspath conversion valve is manually operated according to an embodiment ofthe disclosure.

FIG. 11 provides a circuit diagram of a power-on self-locking circuitand a boost circuit in a control circuit according to an embodiment ofthe disclosure.

FIG. 12 provides a circuit diagram of a pulse ignition circuit and a gasmisconnection flame detection circuit in the control circuit accordingto an embodiment of the disclosure.

FIG. 13 provides a control circuit diagram of a buzzer in the controlcircuit according to an embodiment of the disclosure.

FIG. 14 provides a circuit diagram of an MCU control circuit in thecontrol circuit when the gas path conversion valve is manually operatedaccording to an embodiment of the disclosure.

FIG. 15 provides a circuit diagram of control of a thermocouple voltagein the control circuit in the gas control system according to anembodiment of the disclosure.

FIG. 16 provides a circuit diagram of control of on/off of an on/offvalve in another gas control system according to an embodiment of thedisclosure.

FIG. 17 provides a circuit diagram of the MCU control circuit in thecontrol circuit when the gas path conversion valve is electronicallyoperated according to an embodiment of the disclosure.

FIG. 18 provides a circuit diagram of an electronically controlledconversion valve control circuit in the control circuit according to anembodiment of the disclosure.

FIG. 19 provides a schematic diagram of a structure and connection in agas control system when a gas path conversion valve is electronicallyoperated according to an embodiment of the disclosure.

FIG. 20 provides a schematic cross-sectional view of a manual-type gaspath conversion valve from an angle according to an embodiment of thedisclosure.

FIG. 21 provides a schematic cross-sectional view of the manual-type gaspath conversion valve from another angle according to an embodiment ofthe disclosure.

FIG. 22 provides a schematic structural view of a double gas nozzle onthe manual-type gas path conversion valve from an angle according to anembodiment of the disclosure.

FIG. 23 provides a schematic structural view of the double gas nozzle onthe manual-type gas path conversion valve from another angle accordingto an embodiment of the disclosure.

FIG. 24 provides a schematic structural view of transmission of lowcalorific value gas on the manual-type gas path conversion valveaccording to an embodiment of the disclosure.

FIG. 25 provides a schematic structural view of transmission of highcalorific value gas on the manual-type gas path conversion valveaccording to an embodiment of the disclosure.

FIG. 26 provides a schematic cross-sectional view when a low calorificvalue lighter device outlet and a gas lighter gas path inlet on themanual-type gas path conversion valve are communicated according to anembodiment of the disclosure.

FIG. 27 provides a schematic structural view of a spool on themanual-type gas path conversion valve according to an embodiment of thedisclosure.

FIG. 28 provides a schematic cross-sectional view of a main inlet, thelow calorific value lighter device outlet, and the gas lighter gas pathinlet on a valve body on the manual-type gas path conversion valveaccording to an embodiment of the disclosure.

FIG. 29 provides a schematic cross-sectional view of a state of a damperregulation structure when the low calorific value gas is introduced inthe main inlet on the manual-type gas path conversion valve according toan embodiment of the disclosure.

FIG. 30 provides a schematic cross-sectional view of a state of a damperregulation structure when the high calorific value gas is introduced inthe main inlet on the manual-type gas path conversion valve according toan embodiment of the disclosure.

In the drawings, low calorific value voltage regulator valve 101, highcalorific value voltage regulator valve 102, low calorific value gaspath 103, high calorific value gas path 104, switch control valve 105,first solenoid valve 106, main burner 107, main gas path 108, first maingas nozzle mouth 108 a, second main gas nozzle mouth 108 b, ignition gaspath 109, low calorific value ignition gas path 109 a, high calorificvalue ignition gas path 109 b, low calorific value gas lighter 111, lowcalorific value gas ignition needle 112, low calorific value gasthermocouple 113, high calorific value gas lighter 114, high calorificvalue gas ignition needle 115, high calorific value gas thermocouple116, igniter 117, flame sensor 118, a power supply 119, igniter switch120, an over voltage protection device 121, on/off valve 122, secondsolenoid valve 123, error-proof control circuit 200, power-on circuit201, boost circuit 202, alarm circuit 203, first valve driving chip 204,second valve driving chip 205, gas path conversion valve 3, valve body31, low calorific value gas lighter outlet 3101, high calorific valuegas lighter outlet 3102, gas lighter gas path inlet 3103, main inlet3104, low gas transfer channel 3105, a spool 32, connection groove 3201,first spool hole 3202, second spool hole 3203, valve seat 33, valve rod34, reset spring 36, double gas nozzle 37, circle-shaped barrier 3701,in-circle nozzle mouth 3702, outer nozzle mouth 3703, inner gas transferchamber 38, outer gas transfer chamber 39, first connection short tube310, second connection short tube 31101, first damper 31102, rotationbarrel 31103, second damper 31104, damper linking rod 31105, axiallimitation rib 31106, knob 312, main gas channel switching solenoidvalve 401, ignition gas channel switching solenoid valve 402.

DESCRIPTION OF THE EMBODIMENTS

The disclosure is described in detail in combination with the drawingsand through the embodiments as follows. The following embodiments areexplanations of the disclosure, and the disclosure is not limited to thefollowing embodiments.

Manual operation is required by gas connection and selection of a gaspath conversion valve 3. The following types of misconnection leading tosecurity risks may thereby exist. In the first misconnection type, highcalorific value gas is misconnected to a low calorific value voltageregulator valve 101, mistakenly enters a low calorific value lighter111, and then enters a first main gas nozzle mouth 108 a and a secondmain gas nozzle mouth 108 b in a main gas path 108. In the secondmisconnection type, the high calorific value gas is connected to a highcalorific value voltage regulator valve 102, mistakenly enters the lowcalorific value lighter 111, and then enters the first main gas nozzlemouth 108 a and the second main gas nozzle mouth 108 b in the main gaspath 108. In the third misconnection type, low calorific value gas ismisconnected to the high calorific value voltage regulator valve 102,enters the low calorific value lighter 111, and then enters the firstmain gas nozzle mouth 108 a and the second main gas nozzle mouth 108 bin the main gas path 108.

As shown in FIG. 11, a control circuit provided by the disclosureincludes a power-on circuit 201, connected in series with an externalpower supply 119 and an igniter switch 120 to form a loop. Aself-locking switch triode T1 connected in series with the externalpower supply 119 and a self-locking amplifying triode Q1 connected to abase electrode of the self-locking switch triode T1 are included. On anMCU control circuit, one pin on an MCU control chip U2 is configured todetect whether the power-on circuit 201 is connected, and another pin onthe MCU control chip is connected to a base electrode of theself-locking amplifying triode Q1 in the power-on circuit 201.Preferably, the control circuit further includes a boost circuit 202connected to the power-on circuit 201 and including a boost chip U1 andan inductor L1. A power output pin of the boost chip U1 transmit aboosted voltage to any one or a plurality of the MCU control circuit, apulse ignition circuit, and a gas misconnection flame detection circuit.The operating principle is that when an igniter switch 120 is pressed, aswitch S1 is switched off, and power is turned on. The power supply 119herein is battery powered. An anode BAT+ of the battery reaches a frontend of a boost circuit b of the AP point through the switch S1 and D1.C3, L1, D2, U1, R17, R18, and C18 form a boost voltage VCC1, and aboosted voltage powers the MCU control chip U2 through R16, that is,passing through a VCC end. MCU control chip U2 is powered on, after asignal Lswicth of pin 1 becomes a high electrical level, a 13^(th) pinsends a high electrical level signal powerlatch to a b electrode of pin1 of Q1 through R3 to drive Q1 to be turned on. After Q1 is turned on,pin 3 becomes a low potential from a high potential, and T1 gate Gpasses through R2 and becomes a low potential. T1 is turned on, abattery voltage BAT+ reaches the boost circuit b through T1, the circuitis activated to form activation and perform self-locking. R3, C1, R4,Q1, R2, R1, and T1 form a self-locking circuit. Arrangement of thebooster circuit 202 improves the voltage supply capability to othercircuits in the control circuit. Besides, J1 in FIG. 11 is theconnection terminal of the power-on circuit 201 and the MCU controlcircuit.

As shown in FIG. 14, when a gas path conversion valve 3 is manuallyoperated, the MCU control circuit includes the MCU control chip U2. Pinsof the MCU control chip U2 are introduced as follows. Pin 1 is a LswitchIO input pin and may be used to detect whether a system is powered on.Pin 2 is configured for LfireIN floating and does not provide any otherfunctions. Pin 3 is an L IO input pin and may be used to determinewhether gas is misconnected. Pin 4 is a LightHV IO output pin and isconfigured to control activation and termination of electronic pulseignition. Pin 5 is an AD input pin and is configured to detect batterypower when a system is powered on. Pin 6 P53SCL and pin 7 P52SDA are MCUburning signal pins. Pin 8 VCC and pin 9 GND are MCU anode and cathodepower supply pins. Pin 10 Mag− and pin 11 Mag+ are IO output pins andare configured to control close/open of a second solenoid valve 123 onthe on/off valve 122. Pin 12 is an MCU power-on reset pin Reset. Pin 13PowerLatch is an IO output pin and controls power-on self-locking andpowering off of a system. Pin 14 BUZZER is an IO output pin and controlsactivation/termination of a buzzer. Pin 15 PWML is an IO output pin andcontrols turning off of a first solenoid valve 106 on a switch controlvalve 105. Pin 16 is floating and does not provide any other functions.In addition, JP1 in FIG. 14 is a program burning port and thus may beused to read a control code in the MCU control chip U2 and may also beused to write a new control code into the MCU control chip U2.

As shown in FIG. 17, when the gas path conversion valve 3 iselectrically controlled, the MCU control circuit includes the MCUcontrol chip U2. Pins of the MCU control chip U2 are introduced asfollows. Pin 1 is a Lswitch IO input pin and may be used to detectwhether a system is powered on. Pin 2 detects whether a switch S2 isconnected. Pin 3 is an L IO input pin and may be used to determinewhether gas is misconnected. Pin 4 is a LightHV IO output pin and isconfigured to control activation and termination of electronic pulseignition. Pin 5 is an AD input pin and is configured to detect batterypower when a system is powered on. Pin 6 LPMag+ and pin 7 LPMag− controlclose/open of a lighter solenoid valve. Pin 8 P53SCL and pin 9 P52SDAare MCU burning signal pins. Pin 10 VCC and pin 11 GND are MCU anode andcathode power supply pins. Pin 12 NGMag− and pin 13 NGMag+ are IO outputpins and are configured to control close/open of a master lightersolenoid valve. Pin 14 is an MCU power-on reset pin Reset. Pin 15 Mag+and pin 16 Mag− are IO output pins and are configured to controlclose/open of the on/off valve. Pin 17 PowerLatch is an IO output pinand controls power-on self-locking and powering off of a system. Pin 18BUZZER is an IO output pin and controls activation/termination of abuzzer. Pin 19 PWML is an IO output pin and controls turning off of asolenoid valve in a switch control valve. Pin 20 detects whether aswitch S3 is connected. In addition, JP1 in FIG. 17 is a program burningport and thus may be used to read a control code in the MCU control chipU2 and may also be used to write a new control code into the MCU controlchip U2.

As shown in FIG. 12, a pulse ignition circuit includes an oscillatingloop powered by the power-on circuit 201, and preferably powered by theboost circuit 202. The oscillating loop generates an inducted ignitionhigh pressure and discharges to an outside through an external lowcalorific value gas ignition needle 112 and a high calorific value gasignition needle 115 connected thereto. One pin on the MCU control chipU2 sends a control signal to control magnitude of an oscillating voltageof the oscillating loop. A gas misconnection flame detection circuitincludes a comparator IC2 powered by the power-on circuit 201, andpreferably powered by the boost circuit 202, and is configured forreceiving a flame signal sent from an external flame sensor 118. Thecomparator IC2 is a chip having a model number of LM393. A voltagesignal generated by the flame sensor 118 is transmitted to one input pinof the comparator IC2. The flame signal is outputted from an output pinof the comparator IC2 to a base electrode of a detection amplifyingtriode Q3 connected to the comparator IC2. The flame signal passingthrough the detection amplifying triode Q3 is transmitted onto the MCUcontrol chip U2 through an input pin on the MCU control chip U2 that isconnected to the detection amplification triode Q3 and that isconfigured for receiving the flame signal. When a high calorific valuegas is misconnected to a low calorific value gas lighter 111, the flamesensor 118 generates a negative voltage signal to the input pinconfigured for receiving the flame signal on the comparator IC2. Theoutput pin configured for outputting the flame signal on the comparatorIC2 outputs a high electrical level to the base electrode of thedetection amplifying triode Q3. The detection amplifying triode Q3transmits the amplified flame signal to the input pin configured forreceiving the flame signal on the MCU control chip U2. After an outputpin on the MCU control chipU2 that is configured for sending a drivingsignal for driving a gas path to be cut off receives the flame signalindicating misconnection, the output pin sends the driving signalconfigured for driving the gas path to be cut off to an externalcorresponding gas path on/off control device. A cutting off operation ofa first solenoid valve 106 in a switch control valve 105 is controlledby the gas path on/off control device. The operating principle is thatthe switch S1 in the power-on circuit 201 is switched off, and thebattery voltage BAT+ in the power-on circuit 201 passes through theswitch S1 and the diode D1 and reaches the AP point. A voltage AP passesthrough Q6, C11, R29, DB1, D5, D6, C12, T2, R33, and R28 and forms anoscillating loop. After the MCU control chip U2 detects that a 1^(st)pin has a high potential, a 4^(th) pin transmits a high potential signalLightHV to detect that Q4 is turned on to GND. A resistor R25 and GNDform a loop, the oscillating voltage rises, and a voltage of theoscillating voltage also increases after the oscillating voltage passesthrough the 1^(st) pin of a transformer DB1 and D5 to charge a capacitorC12. When a charging voltage rises to a set voltage value, D6 dischargesGND instantly. After voltages across two ends of C12 are discharged,charging and discharging begin again, and such cycle is performedsequentially. Pins 1 and 3 of a transformer T2 form an alternatingvoltage, and pins 2 and 4 of the transformer T2 generate the inductedignition high pressure. Discharging to the outside is performed throughX1 and X2 discharging needles, and the X1 and X2 herein are a lowcalorific value gas ignition needle 112 and a high calorific value gasignition needle 115. Gas is ignited. After gas is ignited, the flameburns a thermocouple. After the thermocouple generates a thermoelectricpotential to maintain the solenoid valve of the switch control valve tobe closed, the S1 switch is released. When the first pin on the MCUcontrol chip U2 detects that the Lswitch becomes a low-level signal, the4^(th) pin on the MCU control chip U2 outputs a LightHV low levelsignal. When Q4 ends, an oscillating voltage of the oscillating circuitreduces, and X1 and X2 stop discharging and igniting. After flamecombustion on a lighter device is stabilized, if a flame sensor Xa1, theXa1 provided herein is the flame sensor 118, is burned by the flame, a6^(th) pin of IC2 passes the induction pin Xa1 and the ion flame and isconnected to GND through R23, R30, and R32 and generates a negativepressure. A 7^(th) pin of IC2 outputs a high-level signal Lfir to driveQ3 to be turned on, and then the signal L becomes a high potential. Whendetecting that the signal L is of high potential, a 3rd pin on the MCUcontrol chip U2 determines that gas is misconnected. IC2, C10, R21, R22,R23, D4, C13, R30, R31, C14, R32, and Xa1 form a flame detectioncircuit. Note that when the flame sensor Xa1 senses fire, it means thatmisconnection is present, and if no fire is sensed, it means that thereis no misconnection.

The control circuit detects the flame signal transmitted by the externalflame sensor Xa1 connected thereto through the gas misconnection flamedetection circuit and sends the signal to the MCU control circuit. Adriving signal configured for driving the gas path to be cut off to anexternal corresponding gas path on/off control device is sent from theMCU control circuit. In this way, when the high calorific value gas ismisconnected to the low calorific value voltage regulator valve 101,enters the low calorific value gas lighter, the low calorific value gasignition needle 112, the low calorific value gas thermocouple 113, thehigh calorific value gas lighter 114, the high calorific value gasignition needle 115, and high calorific value gas, and simultaneouslyenters the first main gas nozzle mouth 108 a and the second main gasnozzle mouth 108 b, the gas path is closed in time and safety andsecurity are thus provided.

Specifically, as shown in FIG. 15, one output pin on the MCU controlchip U2 configured for transmitting the driving signal for driving thegas path to be cut off is disposed on a wire of opposite polarity to theoutput pin in two wires connected an external thermocouple parallelcircuit and the external first solenoid valve 106. The thermocoupleparallel circuit is formed by a connection between an anode of a lowcalorific value gas thermocouple 113 and an anode of a high calorificvalue gas thermocouple 116 and a connection between a cathode of the lowcalorific value gas thermocouple 113 and a cathode of the high calorificvalue gas thermocouple 116. When the input pin of the MCU control chipU2connected to the gas misconnection flame detection circuit detects thatthe high calorific value gas is misconnected to the low calorific valuegas lighter 111, the output pin on the MCU control chip U2 outputs avoltage of polarity opposite to an output voltage of the thermocoupleparallel circuit. In this way, current balancing is instantly andforcibly performed to a thermoelectric potential generated by the firedlow calorific value gas thermocouple 113 or the voltage is set to zero.As such, the thermoelectric potential which keeps the first solenoidvalve 106 on the switch control valve 105 to be closed is lost, and thefirst solenoid valve 106 is not closed to prevent external gas fromentering. The operating principle is that when the MCU control chip U2detects that gas is misconnected, a 15^(th) pin of the MCU control chipU2 outputs a high-level signal PWML to turn on Q2 through R6. A directvoltage AP flows to the thermocouple and a negative voltage end throughR5 and Q2, the a negative voltage generated by the thermocouple isoffset to zero by the direct voltage AP, the first solenoid valve 106 inthe switch control valve 105 has no voltage and thus is not closed, suchthat the gas path is not connected. When the high calorific value gas ismisconnected to the low calorific value voltage regulator valve 101, avoltage signal of opposite polarity to the thermocouple connected to theMCU control circuit is outputted through the MCU control circuit. Inthis way, current balancing is instantly and forcibly performed to athermoelectric potential generated by the thermocouple or the voltage isset to zero. The thermoelectric potential which keeps the first solenoidvalve 106 on the switch control valve 105 to be closed is lost toprevent external gas from entering the gas path of the system throughthe switch control valve 105 to achieve safety, prevention, and control.

Further, as shown in FIG. 16, a pair of anode and cathode power outputpins configured for transmitting the driving signal for driving the gaspath to be cut off on the MCU control chip U2 is electrically connectedto the external low calorific value gas lighter 111 and a secondsolenoid valve 123 in an on/off valve 122 on a low calorific valueignition gas path 109 a between output ends corresponding to the lowcalorific value gas lighter 111 on a gas path conversion valve 3 througha motor control driver chip. When the input pin connected to the gasmisconnection flame detection circuit on the MCU control chip U2 detectsthat the high calorific value gas is misconnected to the low calorificvalue gas lighter 111, the pair of anode and cathode power output pinstransmits the driving signal for driving the gas path to be cut off, sothat the second solenoid valve 123 on the on/off valve 122 is not closedto close the low calorific value ignition gas path 109 a. A gas flame isreduced until being put out without burning the low calorific value gasthermocouple 113, such that the low calorific value gas thermocouple 113cannot continuously supply power to the first solenoid valve 106 in theswitch control valve 105. The first solenoid valve 106 in the switchcontrol valve 105 does not receive power supply is not closed to preventexternal gas from entering the gas path in the system through the switchcontrol valve 105. The operating principle is that when the MCU controlchip U2 detects that gas is misconnected, a 10^(th) pin Mag− and a11^(th) pin Mag+ of the MCU control chip U2 send a valve off signalthrough R26 and R27 to control IC3 to drive the on/off valve to beswitched off, a gas channel is cut off, and the flame is put out. Whenthe high calorific value gas is misconnected to the low calorific valuevoltage regulator valve 101, a switching off signal is outputted to thesecond solenoid valve 123 on the on/off valve 122 connected to the MCUcontrol circuit through the MCU control circuit, so that the secondsolenoid valve 123 in a closed state is instantly opened. The flame ofthe low calorific value gas lighter 111 may thus be extinguished sinceno low calorific value gas is continuously supplied. The thermocouple nolonger generates a thermoelectric potential since no flame is sensed andthus may not provide electricity energy to the first solenoid valve 106connected thereto on the switch control valve 105. In this way, thefirst solenoid valve 106 is not closed to prevent external gas fromentering the gas path in the system through the switch control valve105. When the high calorific value gas is misconnected to the lowcalorific value voltage regulator valve 101, a switching off signal isoutputted to the second solenoid valve 123 on the on/off valve 122connected to the MCU control circuit through the MCU control circuit, sothat the second solenoid valve 123 in the closed state is instantlyopened. The flame of the low calorific value gas lighter 111 may thus beextinguished since no low calorific value gas is continuously supplied.The thermocouple no longer generates a thermoelectric potential since noflame is sensed and thus may not provide electricity energy to the firstsolenoid valve 106 connected thereto on the switch control valve 105. Inthis way, the first solenoid valve 106 is not closed to prevent externalgas from entering.

As shown in FIG. 13, an alarm circuit 203 including a buzzer and analarm amplifying triode is also included. A base electrode of the alarmamplifying triode receives an alarm signal sent from an output pin onthe MCU control chip U2. During operation, when an output signal BUZZERof the MCU control chip U2 is of high potential, the signal passes R11and drives Q5 to be turned on, a buzzer BK1 passes Q5 to the ground toform a loop, and a sound sounds. When the signal is of low electricallevel, Q5 is turned off, the loop of the buzzer BK1 is switched off, andthe sound stops. R11, C5, Q5, R19, and BK1 form a buzzer driving controlcircuit. Arrangement of the alarm circuit 203 enables a user to obtainalarm information immediately, and total gas paths may be closed througha knob on the switch control valve 105 through manual operation.

As shown in FIG. 18, an electronically controlled conversion valvecontrol circuit is also provided and includes a first valve driving chip204 configured for driving a main gas channel switching solenoid valve401 in an external electronically controlled gas path conversion valveand a second valve driving chip 205 configured for controlling anddriving an ignition gas channel switching solenoid valve 402 in theexternal electronically controlled gas path conversion valve. The firstvalve driving chip 204 and the second valve driving chip 205respectively receive valve control information sent from the MCU controlchip. Two pins in the MCU control chip are respectively connected inseries with a low calorific value voltage regulator switching switch S2in an external low calorific value voltage regulator valve 101 and ahigh calorific value voltage regulator switching switch S3 in a highcalorific value voltage regulator valve 102. When receiving informationon the low calorific value voltage regulator switching switch S2 or thehigh calorific value voltage regulator switching switch S3 being in aclosed state, the MCU control chip sends the corresponding valve controlinformation to the first valve driving chip 204 and the second valvedriving chip 205. Specifically, when a gas tube is connected to a mouthof the high calorific value gas voltage regulator valve 102 or the lowcalorific value gas voltage regulator valve, the low calorific valuevoltage regulator switching switch S2 or the high calorific valuevoltage regulator switching switch S3 is switched off. When a 2^(nd) pinor a 20th pin of the MCU control chip detects that the signal LPswitchor NGswitch is changed to a low electrical level, the 6^(th), 7^(th),12^(th), and 13^(th) pins of the MCU control chip output control signalsLPMag+, LPMag−, NGMag+, and NGMag− to control closing of the main gaschannel switching solenoid valve 401 and the ignition gas channelswitching solenoid valve 402.

As shown in FIG. 1 to FIG. 5, a dual-gas source gas control system withanti-gas source misconnection provided by the disclosure includes a lowcalorific value voltage regulator valve 101 and a high calorific valuevoltage regulator valve 102. An input end and an output end of the lowcalorific value voltage regulator valve 101 are respectivelycommunicated with a low calorific value gas path 103 configured fortransmitting a low calorific gas source, and an input end and an outputend of the high calorific value voltage regulator valve 102 arerespectively communicated with a high calorific value gas path 104configured for transmitting a high calorific gas source. A switchcontrol valve 105 acting as a master switch configured for controlling agas path to be cut off is provided and is provided with a first solenoidvalve 106 configured for controlling the switch control valve 105 to beturned on or turned off. Two input ends are provided, wherein one inputend is connected to the low calorific value voltage regulator valve 101through the low calorific value gas path 103, and the other input end isconnected the high calorific value voltage regulator valve 102 throughthe high calorific value gas path. Two output ends are further providedand are respectively communicated with a main gas path 108 and anignition gas path 109 one by one. A gas path conversion valve 3 includestwo input ends, wherein one input end is connected to an output endcommunicating with the main gas path 108 on the switch control valve105, and the other input end is connected to an output end communicatingwith the ignition gas path 109 on the switch control valve 105. Fouroutput ends are further provided, wherein the four output ends arerespectively communicated with a low calorific value ignition gas path109 a leading to a low calorific value gas ignition device, a highcalorific value ignition gas path 109 b leading to a high calorificvalue gas ignition device, and a first main gas nozzle mouth 108 a and asecond main gas nozzle mouth 108 b leading to a main burner 107 one byone. A high calorific value gas internal path, a low calorific value gasinternal path, and a knob or a switch configured for switching betweenthe high calorific value gas internal path and the low calorific valuegas internal path are further provided. The low calorific value gasinternal path is respectively communicated with low calorific valueignition gas path 109 a, the first main gas nozzle mouth 108 a and asecond main gas nozzle mouth 108 b, and the high calorific value gasinternal path is respectively communicated with the high calorific valueignition gas path 109 b and the first main gas nozzle mouth 108 a. Themain burner 107 is provided, wherein an input end thereof are disposedcorresponding to the first main gas nozzle mouth 108 a and the secondmain gas nozzle mouth 108 b on the gas path conversion valve 3, so thatgas emitted from the first main gas nozzle mouth 108 a and the secondmain gas nozzle mouth 108 b directly enters an input end of the mainburner 107, and a burner opening required by high calorific value gasand low calorific value gas to burn normally is disposed at an outerside. The low calorific value gas ignition device is provided andincludes a low calorific value gas lighter 111 near the burner openingrequired for burning of the low calorific value gas on the main burner107 and a low calorific value gas ignition needle 112 and a lowcalorific value gas thermocouple 113 disposed nearby. The low calorificvalue gas lighter 111 is connected to a corresponding output end on thegas path conversion valve 3 through the low calorific value ignition gaspath 109 a. The high calorific value gas ignition device is provided andincludes a high calorific value gas lighter 114 near the burner openingrequired for burning of the high calorific value gas on the main burner107 and a high calorific value gas ignition needle 115 and a highcalorific value gas thermocouple 116 disposed nearby. The high calorificvalue gas lighter 114 is connected to a corresponding output end on thegas path conversion valve 3 through the high calorific value ignitiongas path 109 b. An igniter 117 is provided and is electrically connectedto the low calorific value gas ignition needle 112 and the highcalorific value gas ignition needle 115 respectively. Further, thesystem also includes a flame sensor 118 disposed at one side near thelow calorific value gas thermocouple 113 and away from the low calorificvalue gas lighter 111 and is configured for detecting a flame signal.The igniter 117 is provided with a power supply 119 and an error-proofcontrol circuit 200 electrically connected thereto. The error-proofcontrol circuit 200 is the control circuit electrically connected to theflame sensor 118. After an igniter switch 120 on the igniter 117 ispressed, electricity is transmitted to the connected control circuit,and the control circuit begins to function and receive the flame signalsent from the flame sensor 118. An anode of the low calorific value gasthermocouple 113 is connected to an anode of the high calorific valuegas thermocouple 116, a cathode of the low calorific value gasthermocouple 113 and a cathode of the high calorific value gasthermocouple 116 are connected to form a thermocouple parallel circuit,and an anode and a cathode of the thermocouple parallel circuit areelectrically connected to an anode and a cathode of the first solenoidvalve 106 respectively one by one. One output end of the control circuitis disposed on one wire of opposite polarity to the output end in twowires connecting the thermocouple parallel circuit and the firstsolenoid valve 106. When the control circuit detects the flame signalfrom the flame sensor 118 indicating that the high calorific value gasis misconnected to the low calorific value gas lighter 111, the outputend outputs a voltage of opposite polarity to an output voltageoutputted by the thermocouple parallel circuit, so that currentbalancing is instantly and forcibly performed to a thermoelectricpotential generated by the fired low calorific value gas thermocouple113 or the voltage is set to zero. The first solenoid valve 106 whichdoes not receive power supply on the switch control valve 105 is notclosed to prevent external gas from entering the gas path in the systemthrough the switch control valve 105. When the high calorific value gasis misconnected to the low calorific value voltage regulator valve 101,a voltage of opposite polarity to an output voltage of the thermocoupleparallel circuit is outputted through the control circuit, so thatcurrent balancing is instantly and forcibly performed to athermoelectric potential generated by the fired low calorific value gasthermocouple 113 or the voltage is set to zero to prevent external gasfrom entering.

Specifically, an over voltage protection device 121 is disposed on thelow calorific value ignition gas path 109 a between the output endscorresponding to the low calorific value gas lighter 111 on the lowcalorific value gas lighter 111 and the gas path conversion valve 3.When the high calorific value gas is mistakenly introduced to the lowcalorific value gas lighter 111 after passing through the high calorificvalue voltage regulator valve 102, or when the low calorific value gasis mistakenly passes through the high calorific value gas voltageregulator valve 102 and is introduced to the low calorific value gaslighter 111, since the pressure of the gas in the low calorific valueignition gas path 109 a exceeds a pressure preset by the over voltageprotection device 121, the over voltage protection device 121automatically closes the gas path at this moment, so no gas enters thelow calorific value gas lighter 111, and the system does not function.

As shown in FIG. 20 to FIG. 30, when the gas path conversion valve 3 isa manual gas path conversion valve, a structure thereof includes a valvebody 31, a spool 32 and a valve seat 33. An outer periphery of the valvebody 31 is provided with an internally-communicated low calorific valuegas lighter outlet 3101, a high calorific value gas lighter outlet 3102,a gas lighter gas path inlet 3103, and a main inlet 3104. The spool 32is provided and is disposed in the valve body 31, and a connectiongroove 3201 is disposed on an outer periphery thereof. The spool 32rotates so that the connection groove 3201 is communicated with the lowcalorific value gas lighter outlet 3101 and the gas lighter gas pathinlet 3103 or is communicated with the high calorific value gas lighteroutlet 3102 and the gas lighter gas path inlet 3103. The valve seat 33is provided and is disposed on an upper end of the valve body 31. Avalve rod 34 is slidably inserted into the valve seat 33, and an upperend of the valve rod 34 exposes out of the valve seat 33. A lower end ofthe valve rod 34 is loosely connected to the other end of a connectionrotation shaft having an end disposed on the spool 32. The connectionrotation shaft is sleeved with a reset spring for resetting the valverod 34 after operation. The gas path conversion valve 3 further includesa double gas nozzle 37 communicated with the main inlet 3104 anddisposed at a lower end of the valve body 31. A circle-shaped barrier3701 is protruded at an inner side of the double gas nozzle 37, and atleast one in-circle nozzle mouth 3702 for the low calorific value gas tobe emitted is provided in the circle-shaped barrier 3701 on the doublegas nozzle 37. At least one outer nozzle mouth 3703 for the lowcalorific value gas or the high calorific value gas to be emitted isdisposed between an outer periphery of the double gas nozzle 37 and thecircle-shaped barrier 3701. An inner gas transfer chamber 38 for merelythe low calorific value gas to enter and an outer gas transfer chamber39 surrounding an outer periphery thereof for the low calorific valuegas and the high calorific value gas to enter are respectively formedwhen the double gas nozzle 37 and the valve body 31 are connected. Theinner gas transfer chamber 38 is communicated with the in-circle nozzlemouth 3702, and the outer gas transfer chamber 39 is communicated withthe outer nozzle mouth 3703. A spool through hole assembly is disposedon the spool 32, and two ends of the spool through hole assembly arerespectively communicated with the inner gas transfer chamber 38 and alow gas transfer channel 3105 communicated with the main inlet 3104 anddisposed on the valve body 31 in a sealed manner. The low calorificvalue gas is introduced in or the high calorific value gas is preventedfrom entering the inner gas transfer chamber 38 through rotation of thespool 32, so that an effective gas-intake cross-sectional areacorresponding to requirement from the high and low calorific value gason the double gas nozzle 37 is adjusted. Through the spool through holeassembly on the spool 32, the low calorific value gas from the maininlet 3104 is introduced into the inner gas transfer chamber 38, or thehigh calorific value gas from the main inlet 3104 is blocked outside theinner gas transfer chamber 38. In this way, the function achieved by alower valve rod provided in the BACKGROUND section is accomplished,requirement for processing accuracy is lowered, the number of componentsis decreased, installation is performed easily, and a simple structureis provided so that mass production may be easily achieved.

Specifically, the spool through hole assembly herein includes a firstspool hole 3202 axially disposed near the end of the double gas nozzle37 on the spool 32. The first spool hole 3202 is communicated with theinner gas transfer chamber 38 in a sealed manner. A second spool hole3203 communicated with the first spool hole 3202 is disposed at an outerside of the spool 32, and the second spool hole 3203 is communicatedwith the low gas transfer channel 3105 in a sealed manner. A simplestructure is thereby provided, and manufacturing may be convenientlyperformed. A first connection short tube 310 is disposed between thecircle-shaped barrier 3701 and the valve body 31 herein in a sealedmanner for transferring the low calorific value gas, so that transferspaces of the inner gas transfer chamber 38 and the outer gas transferchamber 39 are further increased. The double gas nozzle 37 and thecircle-shaped barrier 3701 are integrally connected in one piece, sothat operation may be performed more intensively. Further, a damperregulation structure is disposed between an outer end of the double gasnozzle 37 and a gas main tube b connected to an outer portion of themain burner 107 for regulating gas intake in the gas main tube b, andone end of the damper regulation structure is connected to an outer endof the valve rod 34. In this way, in the damper regulation structure,when the valve rod 34 rotates for regulation, gas intake in the gas maintube b is controlled at the same time, and the demand for diverse flamecolors from some products and users is satisfied as well. The damperregulation structure includes a second connection short tube 31101disposed between the main burner 107 and the external gas main tube b ina sealed manner. A first damper 31102 for air to enter is disposed atone side of the second connection short tube 31101, and a rotationbarrel having a size and a shape matched with that of the secondconnection short tube 31101 is disposed at an outer periphery of thesecond connection short tube 31101. A second damper 31104 correspondingto the first damper 31102 is disposed on the rotation barrel 31103, anda damper linking rod 31105 capable of driving the rotation barrel 31103and the valve rod 34 to simultaneously rotate is disposed between therotation barrel 31103 and the valve rod 34. At least a pair of axiallimitation ribs 31106 for limiting the rotation barrel 31103 to move inan axial direction of the second connection short tube 31101 protrudesfrom an outer side of the second connection short tube 31101, accuracyof control of air intake is further improved. Connection between thedamper linking rod 31105 and the rotation barrel 31103 and connectionbetween the damper linking rod 31105 and the valve rod 34 aredetachable, so that installation and maintenance may be convenientlyperformed. A knob 312 is disposed at an outer end of the valve rod 34,the knob 312 is connected to the damper linking rod 31105, andarrangement of the knob 312 facilitate rotation and regulation performedby the valve rod 34.

Further, the spool 32 is tapered, and the spool 32 matches a size and ashape of a space in the valve body 31 accommodating the spool 32 A lowcalorific value gas limitation groove and a high calorific value gaslimitation groove are disposed in the valve seat 33 in a high and lowmanner and in a misaligned arrangement. A boss is disposed on the valverod 34, the valve rod 34 downwardly moves so that the valve rod 34passes the connection rotation shaft to drive the spool 32 to rotate toswitch the ignition device gas paths between the high and low calorificvalue gas. The boss is engaged in a corresponding limitation groove sothat the valve rod 34 is positioned. A pressure limiting throttle 13 isdisposed between the low calorific value gas lighter outlet 3101 and theexternal low calorific value gas ignition device c. The main function ofthe pressure limiting throttle 13 is to share part of the work of adual-gas source gas lighting protection device. According to theprinciple of existence of a voltage difference between the highcalorific value gas and the low calorific value gas, when operation isperformed incorrectly, part of protection performed by the dual-gassource gas lighting protection device formed by the low calorific valuegas ignition device c and the high calorific value gas ignition device dis transferred to the pressure limiting throttle 13. In this way, designaccuracy and manufacturing accuracy of the dual-gas source gas lightingprotection device may be considerably reduced, and mass production maythereby be easily and conveniently performed. Theory and practice arethereby combined, and a perfect product is delivered to a customer. Theconnection groove 3201 herein has a sector structure with an angle of180 degrees. The low calorific value gas lighter outlet 3101 and the gaslighter gas path inlet 3103 are located on a same center line, and acenter line of the high calorific value gas lighter outlet 3102 and acenter line of the low calorific value gas lighter outlet 3101 are in asame plane.

The operating principle of the manual gas path converter is that: Thevalve rod 34 is pressed and abuts against the connection rotation shaft,and the valve rod 34 then drives the connection rotation shaft connectedto the spool 32 to rotate simultaneously. When the connection groove3201 on the spool 32 is communicated with the low calorific value gaslighter outlet 3101 and the gas lighter gas path inlet 3103, the secondspool hole 3203 on the spool 32 is communicated with the low gastransfer channel 3105. At this moment, one part of the low calorificvalue gas in the main inlet 3104 enters the inner gas transfer chamber38 along the low gas transfer channel 3105 the second spool hole 3203,and the first spool hole 3202 sequentially, passes through inner gastransfer chamber 38, and is finally transmitted to the external gas maintube b from the in-circle nozzle mouth 3702 on the double gas nozzle 37.At the same time, the other part of the low calorific value gas in themain inlet 3104 passes through the main inlet 3104 and directly entersthe outer gas transfer chamber 39, passes through the outer gas transferchamber 39, and is finally transmitted to the external gas main tube bfrom the outer nozzle mouth 3703 on the double gas nozzle 37. Inaddition, the damper regulation structure which simultaneously rotateswith the valve rod 34 is adjusted to be in an air intake inlet staterequired by the low calorific value gas. When the connection groove 3201on the spool 32 is communicated with the high calorific value gaslighter outlet 3102 and the gas lighter gas path inlet 3103, the secondspool hole 3203 on the spool 32 is not communicated with the low gastransfer channel 3105. The high calorific value gas in the main inlet3104 passes through the main inlet 3104 and directly enters the outergas transfer chamber 39, passes through the outer gas transfer chamber39, and is finally transmitted to the external gas main tube b from theouter nozzle mouth 3703 on the double gas nozzle 37. In addition, thedamper regulation structure which simultaneously rotates with the valverod 34 is adjusted to be in the air intake inlet state required by thehigh calorific value gas.

As shown in FIG. 19, when the gas path conversion valve 3 is anelectronically controlled gas path conversion valve, a structure thereofincludes a main gas channel switching solenoid valve 401 respectivelycommunicated with one input end communicating with the main gas path108, one output end communicating with the first main gas nozzle mouth108 a, and one output end communicating with the second main gas nozzlemouth 108 b. Whether gas introduced from the input end is simultaneouslyintroduced to the two output ends or is only introduced to one outputend communicating with the first main gas nozzle mouth 108 a isdetermined according to a gas calorific value. An ignition gas channelswitching solenoid valve 402 is further provided and is communicatedwith one input end communicating with the ignition gas path 109, oneoutput end communicating with the low calorific value ignition gas path109 a, and one output end communicating with the high calorific valueignition gas path 109 b. Whether gas introduced from the input end isintroduced to one output end communicating with the low calorific valueignition gas path 109 a or is introduced to one output end communicatingwith the high calorific value ignition gas path 109 b is determinedaccording to a gas calorific value. Each of the low calorific valuevoltage regulator valve 101 and the high calorific value voltageregulator valve 102 is a switch voltage regulator valve for switching.The low calorific value voltage regulator valve 101 includes a lowcalorific value voltage regulator switching switch S2, and the highcalorific value voltage regulator valve 102 includes a high calorificvalue voltage regulator switching switch S3. In this way, the gas pathconversion valve 3 may automatically achieve gas path conversionaccording to whether the low calorific value voltage regulator switchingswitch S2 or the high calorific value voltage regulator switching switchS3 is switched off. Gas path conversion is not required to be manuallyperformed through manually rotating the knob 312 on the gas pathconversion valve 312 when the system is installed, so that automation isimproved, user may enjoy a convenient using experience, and errorscaused by manual operation are also greatly reduced.

As shown in FIG. 6 to FIG. 10, another dual-gas source gas controlsystem with anti-gas source misconnection provided by the disclosureincludes a low calorific value voltage regulator valve 101 and a highcalorific value voltage regulator valve 102. An input end and an outputend of the low calorific value voltage regulator valve 101 arerespectively communicated with a low calorific value gas path 103configured for transmitting a low calorific gas source, and an input endand an output end of the high calorific value voltage regulator valve102 are respectively communicated with a high calorific value gas path104 configured for transmitting a high calorific gas source. A switchcontrol valve 105 acting as a master switch configured for controlling agas path to be cut off is provided and is provided with a first solenoidvalve 106 configured for controlling the switch control valve 105 to beturned on or turned off. Two input ends are provided, wherein one inputend is connected to the low calorific value voltage regulator valve 101through the low calorific value gas path 103, and the other input end isconnected the high calorific value voltage regulator valve 102 throughthe high calorific value gas path. Two output ends are further providedand are respectively communicated with a main gas path 108 and anignition gas path 109 one by one. A gas path conversion valve 3 includestwo input ends are provided, wherein one input end is connected to anoutput end communicating with the main gas path 108 on the switchcontrol valve 105, and the other input end is connected to an output endcommunicating with the ignition gas path 109 on the switch control valve105. Four output ends are further provided, wherein the four output endsare respectively communicated with a low calorific value ignition gaspath 109 a leading to a low calorific value gas ignition device, a highcalorific value ignition gas path 109 b leading to a high calorificvalue gas ignition device, and a first main gas nozzle mouth 108 a and asecond main gas nozzle mouth 108 b leading to a main burner 107 one byone. A high calorific value gas internal path, a low calorific value gasinternal path, and a knob or a switch configured for switching betweenthe high calorific value gas internal path and the low calorific valuegas internal path are further provided. The low calorific value gasinternal path is respectively communicated with low calorific valueignition gas path 109 a, the first main gas nozzle mouth 108 a, and asecond main gas nozzle mouth 108 b, and the high calorific value gasinternal path is respectively communicated with the high calorific valueignition gas path 109 b and the first main gas nozzle mouth 108 a. Themain burner 107 is provided, wherein an input end thereof are disposedcorresponding to the first main gas nozzle mouth 108 a and the secondmain gas nozzle mouth 108 b on the gas path conversion valve 3, so thatgas emitted from the first main gas nozzle mouth 108 a and the secondmain gas nozzle mouth 108 b directly enters an input end of the mainburner 107, and a burner required by high calorific value gas and lowcalorific value gas to burn normally is disposed at an outer side. Thelow calorific value gas ignition device is provided and includes a lowcalorific value gas lighter 111 near the burner required for burning ofthe low calorific value gas on the main burner 107 and a low calorificvalue gas ignition needle 112 and a low calorific value gas thermocouple113 disposed nearby. The low calorific value gas lighter 111 isconnected to a corresponding output end on the gas path conversion valve3 through the low calorific value ignition gas path 109 a. The highcalorific value gas ignition device is provided and includes a highcalorific value gas lighter 114 near the burner required for burning ofthe high calorific value gas on the main burner 107 and a high calorificvalue gas ignition needle 115 and a high calorific value gasthermocouple 116 disposed nearby. The high calorific value gas lighter114 is connected to a corresponding output end on the gas pathconversion valve 3 through the high calorific value ignition gas path109 b. An igniter 117 is provided and is electrically connected to thelow calorific value gas ignition needle 112 and the high calorific valuegas ignition needle 115 respectively. Further, the system also includesa flame sensor 118 disposed at one side near the low calorific value gasthermocouple 113 and away from the low calorific value gas lighter 111and is configured for detecting a flame signal. The igniter 117 furtherincludes a power supply 119 and an error-proof control circuit 200electrically connected thereto. The error-proof control circuit 200 isthe control circuit according to any one of claims 1 to 6. The controlcircuit is electrically connected to the flame sensor 118. After anigniter switch 120 on the igniter 117 is pressed, electricity providedby the power supply 119 is transmitted to the connected control circuit,and the control circuit begins to function and receive the flame signalsent from the flame sensor 118. An anode of the low calorific value gasthermocouple 113 is connected to an anode of the high calorific valuegas thermocouple 116, a cathode of the low calorific value gasthermocouple 113 and a cathode of the high calorific value gasthermocouple 116 are connected to form a thermocouple parallel circuit,and an anode and a cathode of the thermocouple parallel circuit areelectrically connected to an anode and a cathode of the first solenoidvalve 106 respectively one by one. The low calorific value gasthermocouple 113 generates an electric potential after being burned byignited gas, so as to continuously supply power to the first solenoidvalve 106 in the switch control valve 105, so that the first solenoidvalve 106 stays in a closed state and the gas path continues to beturned on. An on/off valve 122 is disposed on the low calorific valueignition gas path 109 a between output ends corresponding to the lowcalorific value gas lighter 111 on the low calorific value gas lighter111 and the gas path conversion valve 3 and includes a second solenoidvalve 123 configured for controlling connection and cutting off of thelow calorific value ignition gas path 109 a. An anode and a cathode ofthe second solenoid valve 123 are electrically connected to an anodeoutput level and a cathode output level on the control circuit one byone. When the control circuit detects the flame signal from the flamesensor 118 indicating that the high calorific value gas is misconnectedto the low calorific value gas lighter 111, electrical levels outputtedfrom the anode output level and the cathode output level are both zero.The second solenoid valve 123 on the on/off valve 122 is not closed toprevent gas in the low calorific value ignition gas path 109 a fromentering the low calorific value gas lighter 111. A gas flame is reduceduntil being put out without burning the low calorific value gasthermocouple 113, such that the low calorific value gas thermocouple 113cannot continuously supply power to the first solenoid valve 106 in theswitch control valve 105. The first solenoid valve 106 which does notreceive power supply on the switch control valve 105 is not closed toprevent external gas from entering the gas path in the system throughthe switch control valve 105.

Specifically, an over voltage protection device 121 is disposed on thelow calorific value ignition gas path 109 a between the output endscorresponding to the low calorific value gas lighter 111 on the lowcalorific value gas lighter 111 and the gas path conversion valve 3.When the high calorific value gas is mistakenly introduced to the lowcalorific value gas lighter 111 after passing through the high calorificvalue voltage regulator valve 102, or when the low calorific value gasis mistakenly passes through the high calorific value gas voltageregulator valve 102 and is introduced to the low calorific value gaslighter 111, since the pressure of the gas in the low calorific valueignition gas path 109 a exceeds a pressure preset by the over voltageprotection device 121, the over voltage protection device 121automatically closes the gas path at this moment, so no gas enters thelow calorific value gas lighter 111, and the system does not function.

Further, the gas path conversion valve 3 herein may be a manual gas pathconversion valve and may also be an electronically controlled gas pathconversion valve. The specific structure is identical to the gas pathconversion valve 3 in a dual-gas source gas control system with anti-gassource misconnection provided by the disclosure. When the gas pathconversion valve 3 is an electronically controlled gas path conversionvalve, each of the low calorific value voltage regulator valve 101 andthe high calorific value voltage regulator valve 102 is required to be aswitch voltage regulator valve for switching. That is, the low calorificvalue voltage regulator valve 101 is required to include a low calorificvalue voltage regulator switching switch S2, and the high calorificvalue voltage regulator valve 102 is required to include a highcalorific value voltage regulator switching switch S3.

The specific embodiments described herein are merely illustrative of thespirit of the disclosure. A person of ordinary skill in the art may makevarious modifications or additions to the described specific embodimentsor make replacement in a similar manner, but such modification shouldnot depart from the spirit of the disclosure or go beyond the scopedefined by the appended claims.

The following technical terms are used in the specification most of thetime, including: the low calorific value voltage regulator valve 101,the high calorific value voltage regulator valve 102, the low calorificvalue gas path 103, the high calorific value gas path 104, the switchcontrol valve 105, the first solenoid valve 106, the main burner 107,the main gas path 108, the first main gas nozzle mouth 108 a, the secondmain gas nozzle mouth 108 b, the ignition gas path 109, the lowcalorific value ignition gas path 109 a, the high calorific valueignition gas path 109 b, the low calorific value gas lighter 111, thelow calorific value gas ignition needle 112, the low calorific value gasthermocouple 113, the high calorific value gas lighter 114, the highcalorific value gas ignition needle 115, the high calorific value gasthermocouple 116, the igniter 117, the flame sensor 118, the powersupply 119, the igniter switch 120, the over voltage protection device121, the on/off valve 122, the second solenoid valve 123, theerror-proof control circuit 200, the power-on circuit 201, the boostcircuit 202, the alarm circuit 203, and the gas path conversion valve 3.Other technical terms may also be used. These technical terms are usedonly to conveniently describe and explain the nature of the disclosure,and interpretation of the terms as any additional limitation is contraryto the spirit of the disclosure.

What is claimed is:
 1. A control circuit, comprising: a power-oncircuit, connected in series with an external power supply and anigniter switch to form a loop, comprising a self-locking switch triodeconnected in series with the external power supply and a self-lockingamplifying triode connected to a base electrode of the self-lockingswitch triode; an MCU control circuit, comprising an MCU control chip,wherein the power-on circuit is connected to a power input pin of theMCU control chip, one pin on the MCU control chip is configured todetect whether the power-on circuit is connected, another pin on the MCUcontrol chip is connected to a base electrode of the self-lockingamplifying triode in the power-on circuit to be configured to send adriving signal to drive the self-locking amplification triode in thepower-on circuit to be turned on when the power-on circuit is detectedto be connected, so that the self-locking switch triode and theself-locking amplifying triode are turned on to form self-locking andmaintain a power-on state; a pulse ignition circuit, comprising anoscillating loop powered by the power-on circuit, wherein theoscillating loop generates an inducted ignition high voltage anddischarges to an outside through an external low calorific value gasignition needle and a high calorific value gas ignition needle connectedthereto, and one pin on the MCU control chip sends a control signal tocontrol magnitude of an oscillating voltage of the oscillating loop; agas misconnection flame detection circuit, comprising a comparatorpowered by the power-on circuit and configured for receiving a flamesignal sent from an external flame sensor, wherein a voltage signalgenerated by the flame sensor is transmitted to one input pin of thecomparator, the flame signal is outputted from an output pin of thecomparator to a base electrode of a detection amplifying triodeconnected to the comparator, the flame signal passing through thedetection amplifying triode is transmitted onto the MCU control chipthrough an input pin on the MCU control chip that is connected to thedetection amplification triode and that is configured for receiving theflame signal, the flame sensor generates a negative voltage signal tothe input pin configured for receiving the flame signal on thecomparator when a high calorific value gas is misconnected to a lowcalorific value gas lighter, the output pin configured for outputtingthe flame signal on the comparator outputs a high electrical level tothe base electrode of the detection amplifying triode, the detectionamplifying triode transmits the amplified flame signal to the input pinconfigured for receiving the flame signal on the MCU control chip, afteran output pin on the MCU control chip that is configured for sending adriving signal for driving a gas path to be cut off receives the flamesignal indicating misconnection, the output pin sends the driving signalconfigured for driving the gas path to be cut off to an externalcorresponding gas path on/off control device, and a cutting offoperation of a first solenoid valve in a switch control valve iscontrolled by the gas path on/off control device.
 2. The control circuitaccording to claim 1, wherein the output pin on the MCU control chipconfigured for transmitting the driving signal for driving the gas pathto be cut off is disposed on a wire of opposite polarity to the outputpin in two wires connected an external thermocouple parallel circuit andthe external first solenoid valve wherein the thermocouple parallelcircuit is formed by a connection between an anode of a low calorificvalue gas thermocouple and an anode of a high calorific value gasthermocouple and a connection between a cathode of the low calorificvalue gas thermocouple and a cathode of the high calorific value gasthermocouple, the output pin on the MCU control chip outputs a voltageof polarity opposite to an output voltage of the thermocouple parallelcircuit when the input pin of the MCU control chip connected to the gasmisconnection flame detection circuit detects that the high calorificvalue gas is misconnected to the low calorific value gas lighter, sothat current balancing is instantly and forcibly performed to athermoelectric potential generated by the fired low calorific value gasthermocouple or the voltage is set to zero, such that the thermoelectricpotential which keeps the first solenoid valve on the switch controlvalve to be closed is lost, and the first solenoid valve is not closedto prevent external gas from entering the gas path of a dual-gas sourcegas control system through the switch control valve.
 3. The controlcircuit according to claim 1, wherein a pair of anode and cathode poweroutput pins configured for transmitting the driving signal for drivingthe gas path to be cut off on the MCU control chip is electricallyconnected to the external low calorific value gas lighter and a secondsolenoid valve in an on/off valve on a low calorific value ignition gaspath between output ends corresponding to the low calorific value gaslighter on a gas path conversion valve through a motor control driverchip, when the input pin connected to the gas misconnection flamedetection circuit on the MCU control chip detects that the highcalorific value gas is misconnected to the low calorific value gaslighter, the pair of anode and cathode power output pins outputs thedriving signal for driving the gas path to be cut off, such that thesecond solenoid valve which is being closed on the on/off valve isinstantly opened, so that the low calorific value ignition gas path isturned off, a gas flame is reduced until being put out without burningthe low calorific value gas thermocouple, such that the low calorificvalue gas thermocouple cannot continuously supply power to the firstsolenoid valve in the switch control valve, and the first solenoid valvein the switch control valve without receiving power supply is not closedto prevent external gas from entering the gas path in a dual-gas sourcegas control system through the switch control valve.
 4. The controlcircuit according to claim 1, further comprising a boost circuitconnected to the power-on circuit and comprising a boost chip and aninductor, wherein a power output pin of the boost chip transmit aboosted voltage to any one or a plurality of the MCU control circuit,the pulse ignition circuit and the gas misconnection flame detectioncircuit.
 5. The control circuit according to claim 1, further comprisingan alarm circuit comprising a buzzer and an alarm amplifying triode,wherein a base electrode of the alarm amplifying triode receives analarm signal sent from an output pin on the MCU control chip.
 6. Thecontrol circuit according to claim 1, further comprising anelectronically controlled conversion valve control circuit, comprising afirst valve driving chip configured for driving a main gas channelswitching solenoid valve in an external electronically controlled gaspath conversion valve, and a second valve driving chip configured forcontrolling and driving an ignition gas channel switching solenoid valvein the external electronically controlled gas path conversion valve,wherein the first valve driving chip and the second valve driving chiprespectively receive valve control information sent from the MCU controlchip, two pins in the MCU control chip are respectively connected inseries with a low calorific value voltage regulator switching switch inan external low calorific value voltage regulator valve and a highcalorific value voltage regulator switching switch in a high calorificvalue voltage regulator valve, and the MCU control chip sends thecorresponding valve control information to the first valve driving chipand the second valve driving chip when receiving information on the lowcalorific value voltage regulator switching switch or the high calorificvalue voltage regulator switching switch being in a closed state.
 7. Adual-gas source gas control system with anti-gas source misconnection,the dual-gas source gas control system comprising: a low calorific valuevoltage regulator valve and a high calorific value voltage regulatorvalve, wherein an input end and an output end of the low calorific valuevoltage regulator valve are respectively connected to a low calorificvalue gas path) configured for transmitting a low calorific gas source,and an input end and an output end of the high calorific value voltageregulator valve are respectively connected to a high calorific value gaspath configured for transmitting a high calorific gas source; a switchcontrol valve, acting as a master switch configured for controlling agas path to be cut off, provided with a first solenoid valve configuredfor controlling the switch control valve to be turned on or turned off,comprising two input ends, wherein one of the input ends is connected tothe low calorific value voltage regulator valve through the lowcalorific value gas path, and the other one of the input ends isconnected the high calorific value voltage regulator valve through thehigh calorific value gas path, and further comprising two output endsrespectively connected to a main gas path and an ignition gas path oneby one; a gas path conversion valve comprising two input ends, whereinone of the input ends is connected to the output end of the switchcontrol valve communicating with the main gas path, and the other one ofthe input ends is connected to the output end of the switch controlvalve communicating with the ignition gas path, further comprising fouroutput ends, wherein the four output ends are respectively communicatedwith a low calorific value ignition gas path leading to a low calorificvalue gas ignition device, a high calorific value ignition gas pathleading to a high calorific value gas ignition device, and a first maingas nozzle mouth and a second main gas nozzle mouth leading to a mainburner one by one, and further comprising a high calorific value gasinternal path and a low calorific value gas internal path, wherein thelow calorific value gas internal path is respectively communicated withlow calorific value ignition gas path, the first main gas nozzle mouthand a second main gas nozzle mouth, and the high calorific value gasinternal path is respectively communicated with the high calorific valueignition gas path and the first main gas nozzle mouth; the main burner,wherein an input end thereof are disposed corresponding to the firstmain gas nozzle mouth and the second main gas nozzle mouth on the gaspath conversion valve, so that gas emitted from the first main gasnozzle mouth and the second main gas nozzle mouth directly enters theinput end of the main burner, and a burner opening required by highcalorific value gas and low calorific value gas to burn normally isdisposed at an outer side of the main burner; the low calorific valuegas ignition device, comprising a low calorific value gas lighter nearthe burner opening required for burning of the low calorific value gason the main burner, a low calorific value gas ignition needle and a lowcalorific value gas thermocouple disposed adjacent to the low calorificvalue gas lighter, wherein the low calorific value gas lighter isconnected to a corresponding output end on the gas path conversion valvethrough the low calorific value ignition gas path; the high calorificvalue gas ignition device, comprising a high calorific value gas lighternear the burner opening required for burning of the high calorific valuegas on the main burner and a high calorific value gas ignition needleand a high calorific value gas thermocouple disposed adjacent to thehigh calorific value gas lighter, wherein the high calorific value gaslighter is connected to a corresponding output end on the gas pathconversion valve through the high calorific value ignition gas path; anigniter, electrically connected to the low calorific value gas ignitionneedle and the high calorific value gas ignition needle respectively;the dual-gas source gas control system further comprises: a flame sensordisposed at one side near the low calorific value gas thermocouple andaway from the low calorific value gas lighter, and configured fordetecting a flame signal; wherein the igniter is provided with a powersupply and an error-proof control circuit electrically connectedthereto, the error-proof control circuit is the control circuitaccording to claim 1, the control circuit is electrically connected tothe flame sensor, after an igniter switch on the igniter is pressed,electricity is transmitted to the connected control circuit, and thecontrol circuit begins to function and receive the flame signal sentfrom the flame sensor; wherein an anode of the low calorific value gasthermocouple is connected to an anode of the high calorific value gasthermocouple, a cathode of the low calorific value gas thermocouple anda cathode of the high calorific value gas thermocouple are connected toform a thermocouple parallel circuit, an anode and a cathode of thethermocouple parallel circuit are electrically connected to an anode anda cathode of the first solenoid valve respectively one by one, oneoutput end of the control circuit is disposed on one wire of oppositepolarity to the output end in two wires connecting the thermocoupleparallel circuit and the first solenoid valve when the control circuitdetects the flame signal from the flame sensor indicating that the highcalorific value gas is misconnected to the low calorific value gaslighter, the output end outputs a voltage of opposite polarity to anoutput voltage outputted by the thermocouple parallel circuit, so thatcurrent balancing is instantly and forcibly performed to athermoelectric potential generated by the fired low calorific value gasthermocouple or the voltage is set to zero, the first solenoid valve inthe switch control valve without receiving power supply is not closed toprevent external gas from entering the gas path in the system throughthe switch control valve.
 8. The dual-gas source gas control system withanti-gas source misconnection according to claim 7, wherein an overvoltage protection device is disposed on the low calorific valueignition gas path between the output ends corresponding to the lowcalorific value gas lighter on the low calorific value gas lighter andthe gas path conversion valve.
 9. The dual-gas source gas control systemwith anti-gas source misconnection according to claim 7, wherein the gaspath conversion valve is a manual gas path conversion valve andcomprises: a valve body, wherein an outer periphery of the valve body isprovided with an internally-communicated low calorific value gas lighteroutlet, a high calorific value gas lighter outlet, a gas lighter gaspath inlet and a main inlet; a spool, provided and disposed in the valvebody, wherein a connection groove is disposed on an outer periphery ofthe spool, the spool rotates so that the connection groove iscommunicated with the low calorific value gas lighter outlet and the gaslighter gas path inlet or is communicated with the high calorific valuegas lighter outlet and the gas lighter gas path inlet; a valve seat,provided and disposed on an upper end of the valve body, wherein a valverod is slidably inserted into the valve seat, an upper end of the valverod exposes out of the valve seat, a lower end of the valve rod isloosely connected to the other end of a connection rotation shaft withone end disposed on the spool, the connection rotation shaft is sleevedwith a reset spring for resetting the valve rod after operation; and adouble gas nozzle, communicated with the main inlet and disposed at anlower end of the valve body, a circle-shaped barrier is protruded at aninner side of the double gas nozzle, at least one in-circle nozzle mouthmerely for the low calorific value gas to be emitted is provided in thecircle-shaped barrier on the double gas nozzle, at least one outernozzle mouth for the low calorific value gas or the high calorific valuegas to be emitted is disposed between an outer periphery of the doublegas nozzle and the circle-shaped barrier, the first main gas nozzlemouth is the outer nozzle mouth, and the second main gas nozzle mouth isthe in-circle nozzle mouth, an inner gas transfer chamber for merely thelow calorific value gas to enter and an outer gas transfer chambersurrounding an outer periphery of the inner gas transfer chamber for thelow calorific value gas or the high calorific value gas to enter arerespectively formed when the double gas nozzle and the valve body areconnected, the inner gas transfer chamber is communicated with thein-circle nozzle mouth, and the outer gas transfer chamber iscommunicated with the outer nozzle mouth; a spool through hole assemblyis disposed on the spool, two ends of the spool through hole assemblyare respectively communicated with the inner gas transfer chamber and alow gas transfer channel communicated with the main inlet and disposedon the valve body in a sealed manner, and the low calorific value gas isintroduced in or the high calorific value gas is prevented from enteringthe inner gas transfer chamber through rotation of the spool, so that aneffective gas-intake cross-sectional area corresponding to requirementfrom the high and low calorific value gas on the double gas nozzle isadjusted.
 10. The dual-gas source gas control system with anti-gassource misconnection according to claim 9, wherein the spool throughhole assembly comprises a first spool hole axially disposed near an endof the double gas nozzle on the spool, the first spool hole iscommunicated with the inner gas transfer chamber in a sealed manner, asecond spool hole communicating with the first spool hole is disposed atan outer side of the spool, the second spool hole is communicated withthe low gas transfer channel in a sealed manner; the spool is tapered,the spool matches a size and a shape of a space in the valve bodyaccommodating the spool, a low calorific value gas limitation groove anda high calorific value gas limitation groove are disposed in the valveseat in a high and low manner and in a misaligned arrangement, a boss isdisposed on the valve rod, the valve rod downwardly moves so that thevalve rod passes the connection rotation shaft to drive the spool torotate to switch the ignition device gas paths between the high and lowcalorific value gas, the boss is engaged in a corresponding limitationgroove so that the valve rod is positioned; the connection groove has asector structure with an angle of 180 degrees, the low calorific valuegas lighter outlet and the gas lighter gas path inlet are located on asame center line, a center line of the high calorific value gas lighteroutlet and a center line of the low calorific value gas lighter outletare in a same plane; a damper regulation structure for regulating gasintake in a gas main tube is disposed between an outer end of the doublegas nozzle and the gas main tube connected to an outer portion of themain burner, and one end of the damper regulation structure is connectedto an outer end of the valve rod.
 11. The dual-gas source gas controlsystem with anti-gas source misconnection according to claim 10, whereina first connection short tube is disposed between the circle-shapedbarrier and the valve body in a sealed manner for transferring the lowcalorific value gas; the double gas nozzle and the circle-shaped barrierare integrally connected in one piece; the damper regulation structurecomprises a second connection short tube disposed between the mainburner and the external gas main tube in a sealed manner, a first damperfor air to enter is disposed at one side of the second connection shorttube, a rotation barrel having a size and a shape matched with that ofthe second connection short tube is disposed at an outer periphery ofthe second connection short tube, a second damper corresponding to thefirst damper is disposed on the rotation barrel, a damper linking rodcapable of driving the rotation barrel and the valve rod tosimultaneously rotate is disposed between the rotation barrel and thevalve rod; at least a pair of axial limitation ribs for limiting therotation barrel to move in an axial direction of the second connectionshort tube protrudes from an outer side of the second connection shorttube; connection between the damper linking rod and the rotation barreland connection between the damper linking rod and the valve rod aredetachable; a knob is disposed at an outer end of the valve rod, and theknob is connected to the damper linking rod.
 12. The dual-gas source gascontrol system with anti-gas source misconnection according to claim 7,wherein the gas path conversion valve is an electronically controlledgas path conversion valve and comprises a main gas channel switchingsolenoid valve respectively communicated with one input endcommunicating with the main gas path, one output end communicating withthe first main gas nozzle mouth, and one output end communicating withthe second main gas nozzle mouth, whether gas introduced from the inputend is simultaneously introduced to the two output ends or is onlyintroduced to one output end communicating with the first main gasnozzle mouth is determined according to a gas calorific value, anignition gas channel switching solenoid valve is further provided and iscommunicated with one input end communicating with the ignition gaspath, one output end communicating with the low calorific value ignitiongas path and one output end communicating with the high calorific valueignition gas path, whether gas introduced from the input end isintroduced to one output end communicating with the low calorific valueignition gas path or is introduced to one output end communicating withthe high calorific value ignition gas path is determined according to agas calorific value; each of the low calorific value voltage regulatorvalve and the high calorific value voltage regulator valve is a switchvoltage regulator valve for switching, the low calorific value voltageregulator valve comprises a low calorific value voltage regulatorswitching switch, and the high calorific value voltage regulator valvecomprises a high calorific value voltage regulator switching switch. 13.A dual-gas source gas control system with anti-gas source misconnection,the dual-gas source gas control system comprising: a low calorific valuevoltage regulator valve and a high calorific value voltage regulatorvalve, wherein an input end and an output end of the low calorific valuevoltage regulator valve are respectively connected to a low calorificvalue gas path configured for transmitting a low calorific gas source,and an input end and an output end of the high calorific value voltageregulator valve are respectively connected to a high calorific value gaspath configured for transmitting a high calorific gas source; a switchcontrol valve, acting as a master switch configured for controlling agas path to be cut off, provided with a first solenoid valve configuredfor controlling the switch control valve to be turned on or turned off,comprising two input ends, wherein one of the input ends is connected tothe low calorific value voltage regulator valve through the lowcalorific value gas path, and the other one of the input ends isconnected the high calorific value voltage regulator valve through thehigh calorific value gas path, and further comprising two output ends,respectively connected to a main gas path and an ignition gas path oneby one; a gas path conversion valve comprising two input ends, whereinone of the input ends is connected to the output end of the switchcontrol valve communicating with the main gas path, and the other one ofthe input ends is connected to the output end of the switch controlvalve communicating with the ignition gas path, further comprising fouroutput ends, wherein the four output ends are respectively communicatedwith a low calorific value ignition gas path leading to a low calorificvalue gas ignition device, a high calorific value ignition gas pathleading to a high calorific value gas ignition device, and a first maingas nozzle mouth and a second main gas nozzle mouth leading to a mainburner one by one, and further comprising a high calorific value gasinternal path, a low calorific value gas internal path and a knob or aswitch configured for switching between the high calorific value gasinternal path and the low calorific value gas internal path, wherein thelow calorific value gas internal path is respectively communicated withlow calorific value ignition gas path, the first main gas nozzle mouthand a second main gas nozzle mouth, and the high calorific value gasinternal path is respectively communicated with the high calorific valueignition gas path and the first main gas nozzle mouth; the main burner,wherein an input end thereof are disposed corresponding to the firstmain gas nozzle mouth and the second main gas nozzle mouth on the gaspath conversion valve, so that gas emitted from the first main gasnozzle mouth and the second main gas nozzle mouth directly enters theinput end of the main burner, and a burner opening required by highcalorific value gas and low calorific value gas to burn normally isdisposed at an outer side of the main burner; the low calorific valuegas ignition device, comprising a low calorific value gas lighter nearthe burner opening required for burning of the low calorific value gason the main burner, a low calorific value gas ignition needle and a lowcalorific value gas thermocouple disposed adjacent to the low calorificvalue gas lighter, wherein the low calorific value gas lighter isconnected to a corresponding output end on the gas path conversion valvethrough the low calorific value ignition gas path; the high calorificvalue gas ignition device, comprising a high calorific value gas lighternear the burner opening required for burning of the high calorific valuegas on the main burner and a high calorific value gas ignition needleand a high calorific value gas thermocouple disposed adjacent to thehigh calorific value gas lighter, wherein the high calorific value gaslighter is connected to a corresponding output end on the gas pathconversion valve through the high calorific value ignition gas path; anigniter, electrically connected to the low calorific value gas ignitionneedle and the high calorific value gas ignition needle respectively;the dual-gas source gas control system further comprises: a flame sensordisposed at one side near the low calorific value gas thermocouple andaway from the low calorific value gas lighter, and configured fordetecting a flame signal; wherein the igniter further comprises a powersupply and an error-proof control circuit electrically connectedthereto, the error-proof control circuit is the control circuitaccording to claim 1, the control circuit is electrically connected tothe flame sensor, after an igniter switch on the igniter is pressed,electricity provided by the power supply is transmitted to the connectedcontrol circuit, and the control circuit begins to function and receivethe flame signal sent from the flame sensor; wherein an anode of the lowcalorific value gas thermocouple is connected to an anode of the highcalorific value gas thermocouple, a cathode of the low calorific valuegas thermocouple and a cathode of the high calorific value gasthermocouple are connected to form a thermocouple parallel circuit, ananode and a cathode of the thermocouple parallel circuit areelectrically connected to an anode and a cathode of the first solenoidvalve respectively one by one, the low calorific value gas thermocouplegenerates an electric potential after being burned by ignited gas, so asto continuously supply power to the first solenoid valve in the switchcontrol valve, so that the first solenoid valve stays in a closed stateand the gas path is in a turned on state; an on/off valve disposed onthe low calorific value ignition gas path between output endscorresponding to the low calorific value gas lighter on the lowcalorific value gas lighter and the gas path conversion valve,comprising a second solenoid valve configured for controlling connectionand cutting off of the low calorific value ignition gas path, wherein ananode and a cathode of the second solenoid valve are electricallyconnected to an anode output level and a cathode output level on thecontrol circuit one by one, when the control circuit detects the flamesignal from the flame sensor indicating that the high calorific valuegas is misconnected to the low calorific value gas lighter, electricallevels outputted from the anode output level and the cathode outputlevel are both zero, the second solenoid valve on the on/off valve isnot closed to prevent gas in the low calorific value ignition gas pathfrom entering the low calorific value gas lighter, a gas flame isreduced until being put out without burning the low calorific value gasthermocouple, such that the low calorific value gas thermocouple cannotcontinuously supply power to the first solenoid valve in the switchcontrol valve, and the first solenoid valve in the switch control valvewithout receiving power supply is not closed to prevent external gasfrom entering the gas path in the system through the switch controlvalve.
 14. The dual-gas source gas control system with anti-gas sourcemisconnection according to claim 13, wherein an over voltage protectiondevice is disposed on the low calorific value ignition gas path betweenthe output ends corresponding to the low calorific value gas lighter onthe low calorific value gas lighter and the gas path conversion valve.15. The dual-gas source gas control system with anti-gas sourcemisconnection according to claim 13, wherein the gas path conversionvalve is a manual gas path conversion valve and comprises: a valve body,wherein an outer periphery of the valve body is provided with aninternally-communicated low calorific value gas lighter outlet, a highcalorific value gas lighter outlet, a gas lighter gas path inlet, and amain inlet; a spool, provided and disposed in the valve body, wherein aconnection groove is disposed on an outer periphery of the spool, thespool rotates so that the connection groove is communicated with the lowcalorific value gas lighter outlet and the gas lighter gas path inlet oris communicated with the high calorific value gas lighter outlet and thegas lighter gas path inlet; a valve seat, provided and disposed on anupper end of the valve body, wherein a valve rod is slidably insertedinto the valve seat, an upper end of the valve rod exposes out of thevalve seat, a lower end of the valve rod is loosely connected to theother end of a connection rotation shaft with one end disposed on thespool, the connection rotation shaft is sleeved with a reset spring forresetting the valve rod after operation; and a double gas nozzle,communicated with the main inlet and disposed at an lower end of thevalve body, a circle-shaped barrier is protruded at an inner side of thedouble gas nozzle, at least one in-circle nozzle mouth for the lowcalorific value gas to be emitted is provided in the circle-shapedbarrier on the double gas nozzle, at least one outer nozzle mouth forthe low calorific value gas or the high calorific value gas to beemitted is disposed between an outer periphery of the double gas nozzleand the circle-shaped barrier, the first main gas nozzle mouth is theouter nozzle mouth, and the second main gas nozzle mouth is thein-circle nozzle mouth, an inner gas transfer chamber for merely the lowcalorific value gas to enter and an outer gas transfer chambersurrounding an outer periphery of the inner gas transfer chamber for thelow calorific value gas or the high calorific value gas to enter arerespectively formed when the double gas nozzle and the valve body areconnected, the inner gas transfer chamber is communicated with thein-circle nozzle mouth, and the outer gas transfer chamber iscommunicated with the outer nozzle mouth a spool through hole assemblyis disposed on the spool, two ends of the spool through hole assemblyare respectively communicated with the inner gas transfer chamber and alow gas transfer channel communicated with the main inlet and disposedon the valve body in a sealed manner, and the low calorific value gas isintroduced in or the high calorific value gas is prevented from enteringthe inner gas transfer chamber through rotation of the spool, so that aneffective gas-intake cross-sectional area corresponding to requirementfrom the high and low calorific value gas on the double gas nozzle isadjusted.
 16. The dual-gas source gas control system with anti-gassource misconnection according to claim 15, wherein the spool throughhole assembly comprises a first spool hole axially disposed near an endof the double gas nozzle on the spool, the first spool hole iscommunicated with the inner gas transfer chamber in a sealed manner, asecond spool hole communicated with the first spool hole is disposed atan outer side of the spool, the second spool hole is communicated withthe low gas transfer channel in a sealed manner; the spool is tapered,the spool matches a size and a shape of a space in the valve bodyaccommodating the spool, a low calorific value gas limitation groove anda high calorific value gas limitation groove are disposed in the valveseat in a high and low manner and in a misaligned arrangement, a boss isdisposed on the valve rod, the valve rod downwardly moves so that thevalve rod passes the connection rotation shaft to drive the spool torotate to switch the ignition device gas paths between the high and lowcalorific value gas, the boss is engaged in a corresponding limitationgroove so that the valve rod is positioned; the connection groove has asector structure with an angle of 180 degrees, the low calorific valuegas lighter outlet and the gas lighter gas path inlet are located on asame center line, a center line of the high calorific value gas lighteroutlet and a center line of the low calorific value gas lighter outletare in a same plane; a damper regulation structure for regulating gasintake in a gas main tube is disposed between an outer end of the doublegas nozzle and the gas main tube connected to an outer portion of themain burner, and one end of the damper regulation structure is connectedto an outer end of the valve rod.
 17. The dual-gas source gas controlsystem with anti-gas source misconnection according to claim 16, whereina first connection short tube is disposed between the circle-shapedbarrier and the valve body in a sealed manner for transferring the lowcalorific value gas; the double gas nozzle and the circle-shaped barrierare integrally connected in one piece; the damper regulation structurecomprises a second connection short tube disposed between the mainburner and the external gas main tube in a sealed manner, a first damperfor air to enter is disposed at one side of the second connection shorttube, a rotation barrel having a size and a shape matched with that ofthe second connection short tube is disposed at an outer periphery ofthe second connection short tube, a second damper corresponding to thefirst damper is disposed on the rotation barrel, a damper linking rodcapable of driving the rotation barrel and the valve rod tosimultaneously rotate is disposed between the rotation barrel and thevalve rod; at least a pair of axial limitation ribs for limiting therotation barrel to move in an axial direction of the second connectionshort tube protrudes from an outer side of the second connection shorttube; connection between the damper linking rod and the rotation barreland connection between the damper linking rod and the valve rod aredetachable; a knob is disposed at an outer end of the valve rod, and theknob is connected to the damper linking rod.
 18. The dual-gas source gascontrol system with anti-gas source misconnection according to claim 13,wherein the gas path conversion valve is an electronically controlledgas path conversion valve and comprises a main gas channel switchingsolenoid valve respectively communicated with one input endcommunicating with the main gas path, one output end communicating withthe first main gas nozzle mouth, and one output end communicating withthe second main gas nozzle mouth whether gas introduced from the inputend is simultaneously introduced to the two output ends or is onlyintroduced to one output end communicating with the first main gasnozzle mouth is determined according to a gas calorific value, anignition gas channel switching solenoid valve is further provided and iscommunicated with one input end communicating with the ignition gaspath, one output end communicating with the low calorific value ignitiongas path, and one output end communicating with the high calorific valueignition gas path, whether gas introduced from the input end isintroduced to one output end communicating with the low calorific valueignition gas path or is introduced to one output end communicating withthe high calorific value ignition gas path is determined according to agas calorific value; each of the low calorific value voltage regulatorvalve and the high calorific value voltage regulator valve is a switchvoltage regulator valve for switching, the low calorific value voltageregulator valve comprises a low calorific value voltage regulatorswitching switch, and the high calorific value voltage regulator valvecomprises a high calorific value voltage regulator switching switch.